CN102118453A

CN102118453A - Method, service device, client and communication system for automatic configuration of IP address

Info

Publication number: CN102118453A
Application number: CN2009102153852A
Authority: CN
Inventors: 蓝海青
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2009-12-31
Filing date: 2009-12-31
Publication date: 2011-07-06
Anticipated expiration: 2029-12-31
Also published as: WO2011079786A1; CN102118453B

Abstract

The present invention discloses a method, a service device, a client and a communication system for automatic configuration of an IP address. The method comprises the following steps of: determining the client with a formal IP address within a communication range which the client to be configured with the formal IP address belongs to, wherein the formal IP address is a configured IP address; sending a relay configuration indication message to the client with the formal IP address, wherein the relay configuration indication message carries DHCP (Dynamic Host Configuration Protocol) configuration information; and after the client with the formal IP address is configured to a DHCP repeater according to the DHCP configuration information, allocating the formal IP address for the client to be configured with the formal IP address by the client configured to the DHCP repeater. In the embodiment of the invention, a specialized DHCP repeater is not needed to be arranged when the IP address is automatically configured by using the DHCP, thereby reducing investment and maintenance cost of the system.

Description

IP address automatic distributing method, server device, client computer and communication system

Technical field

The embodiment of the invention relates to the network communications technology, relates in particular to a kind of IP address automatic distributing method, server device, client computer and communication system.

Background technology

Internet protocol (Internet Protocol, IP) address can be used as the sign of subscriber equipment and the sign of the network equipment in IP network, also can be used as the sign that the IP bag is transmitted, and therefore, the configuration of IP address is an entire I P server.The IP address comprises IPv4 address and IPv6 address, is example with the IPv4 address, and the IPv4 address is the address of 32 binary codes, and (Identify is ID) with host id two parts to comprise network identity.Different network IDs is configured the network segment to different gateways, and the All hosts of consolidated network ID hangs under the same network segment of same gateway, and therefore, the configuration of IP address is not only unique, but also need plan corresponding network ID according to the network segment of the gateway that inserts.Further, the network segment under client computer is divided into a plurality of VLANs (Virtual Local AreaNetwork is in the time of VLAN), different VLAN adopts different IP address planning, at this moment, and during for client configuration IP address, not only network segment information to be considered, also vlan information will be considered.The IP address is a logical address, need be corresponding with the physical label of equipment, and for example, (therefore Media Access Control, MAC) address correspondence, also need during the IP address configuration to carry out related with MAC Address with the medium access control of equipment.

Manual configuration IP address mode is arranged and obtain the mode of IP address automatically in the IP address configuration scheme at present, wherein, what generally adopt is the mode of obtaining the IP address automatically.(Dynamic Host Configuration Protocol is in the present IP network automatic IP address configuring technical the most widely to be arranged DHCP) to DHCP.The DHCP technology relates to server and client computer, by the configuration data of server centered IP network management, and the DHCP of responsible processing client request, be client configuration IP address; Client computer is used the IP address of server configuration.

The flow process of DHCP is roughly as follows:

When the first step, client computer were found not have the IP configuration data on this machine, then a DHCP search of broadcasting (DHCP DISCOVER) was wrapped in network;

Second step, can be after Dynamic Host Configuration Protocol server listens to the DHCP search bag that client computer sends to IP address of this client configuration, the IP address of configuration and remaining IP configuration data are carried at DHCP respond in (DHCP OFFER) bag and return to client computer;

The 3rd step, after client computer receives that DHCP that a plurality of servers return responds bag, in a plurality of DHCP bags, select an IP address, perhaps, after client computer only receives that DHCP that a server returns responds bag, select the IP address in this DHCP bag, and to dhcp broadcast of Web broadcast (DHCP REQUEST) bag, the IP address that this client computer of the Servers-all in the informing network is selected;

The 4th step, after server receives the dhcp broadcast bag, return DHCP to client computer and confirm (DHCP ACK) bag, formally effective to confirm the IP configuration, finish whole dhcp process.

Wherein, in the above-mentioned flow process, when client-server is positioned at the different network segments, in this network, also need to be provided with a DHCP relay device (Relay), transmit the mutual bag that transmits between the client-server by the DHCP relay device, for example, above-mentioned DHCP search bag, DHCP respond bag, dhcp broadcast bag and DHCP and confirm bag.

There are the following problems at least in the prior art: when the client-server among the DHCP is positioned at the different network segments, need special-purpose DHCP relay device, can increase input undoubtedly and maintenance cost and special-purpose DHCP relay device is set.

Summary of the invention

The embodiment of the invention provides a kind of IP address automatic distributing method, server device, client computer and communication system, in order to solve the needs special use that exists in the prior art input and the maintenance cost problem of higher that the DHCP relay device causes is set.

The embodiment of the invention provides a kind of IP address automatic distributing method, comprising: in the communication range of server device under the client computer of formal IP to be configured address, determine to have the client computer of formal IP address, the IP address of this formal IP address for having disposed; This server device sends relaying configuration Indication message to this client computer with formal IP address, carries the dynamic host configuration protocol DHCP configuration information in this relaying configuration Indication message; After this client computer with formal IP address was configured to the DHCP relay device according to this DHCP configuration information with this machine, this server device was by being configured to the client computer of DHCP relay device, for the client computer of this formal IP to be configured address is distributed formal IP address.

The embodiment of the invention also provides a kind of IP address automatic distributing method, comprise: the client computer that has had formal IP address receives the relaying configuration Indication message that server device sends, carry the dynamic host configuration protocol DHCP configuration information in this relaying configuration Indication message, this client computer that has had the client computer of formal IP address and formal IP to be configured address is in same communication range; This client computer that has had formal IP address is configured to the DHCP relay device according to this DHCP configuration information with this machine; The client computer that is configured to the DHCP relay device provides dhcp relay feature, realizes that this server device distributes formal IP address for the client computer of this formal IP to be configured address.

The embodiment of the invention provides a kind of server device, comprising: the client computer determination module is used for determining to have the client computer of formal IP address in the communication range under the client computer of formal IP to be configured address the IP address of this formal IP address for having disposed; Sending module is used for sending relaying configuration Indication message to this client computer with formal IP address, carries the dynamic host configuration protocol DHCP configuration information in this relaying configuration Indication message; Distribution module is used for after this client computer with formal IP address is configured to the DHCP relay device according to this DHCP configuration information with this machine, by being configured to the client computer of DHCP relay device, for the client computer of this formal IP to be configured address is distributed formal IP address.

The embodiment of the invention provides a kind of client computer, comprising: receiver module, be used to receive the relaying configuration Indication message that server device sends, and carry the dynamic host configuration protocol DHCP configuration information in this relaying configuration Indication message; Configuration module is used for according to this DHCP configuration information this machine being configured to the DHCP relay device; Trunk module is used to provide dhcp relay feature, realizes that this server device is that the client computer of formal IP to be configured address is distributed formal IP address.

The embodiment of the invention provides a kind of communication system, comprising: above-mentioned server device; And above-mentioned client computer.

The embodiment of the invention becomes the DHCP relay device by the client configuration with formal IP address, can need not to be provided with special-purpose DHCP relay device in network system when adopting the DHCP configuration of IP address, realizes the reduction of network input and maintenance cost.

Description of drawings

In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use is done an introduction simply in will describing embodiment below, apparently, accompanying drawing in describing below is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is the method flow schematic diagram of first embodiment of the invention;

Fig. 2 is the method flow schematic diagram of second embodiment of the invention;

Fig. 3 is the method flow schematic diagram of third embodiment of the invention;

Fig. 4 is the network architecture schematic diagram of third embodiment of the invention correspondence;

Fig. 5 is the method flow schematic diagram of fourth embodiment of the invention;

Fig. 6 is the network architecture schematic diagram of fourth embodiment of the invention correspondence;

Fig. 7 is the method flow schematic diagram of fifth embodiment of the invention;

Fig. 8 is the network architecture schematic diagram of fifth embodiment of the invention correspondence;

Fig. 9 is the method flow schematic diagram of sixth embodiment of the invention;

Figure 10 is the network architecture schematic diagram of sixth embodiment of the invention correspondence;

Figure 11 is the server device structural representation of seventh embodiment of the invention;

Figure 12 is the client architecture schematic diagram of eighth embodiment of the invention;

Figure 13 is the communication system architecture schematic diagram of ninth embodiment of the invention.

Embodiment

For the purpose, technical scheme and the advantage that make the embodiment of the invention clearer, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that is obtained under the creative work prerequisite.

Fig. 1 is the method flow schematic diagram of first embodiment of the invention, comprising:

Step 11: in the communication range of server device under the client computer of formal IP to be configured address, determine to have the client computer of formal IP address, the IP address of this formal IP address for having disposed.

Wherein, server device can comprise the DHCP unit, and this DHCP unit can provide dhcp server functionality, and promptly when client computer adopted DHCP flow process request IP address, this DHCP unit can provide corresponding formal IP address for client computer.

In order to make the dhcp process smooth implementation, this server device can also comprise that (IP Auto Configuration Protocol, IACP) unit, this IACP unit are used to client computer to distribute temporary ip address to the automatic address distributorship agreement.

Above-mentioned DHCP unit and IACP unit can be arranged in same physical entity, and at this moment, server device can be specially the physical entity under this DHCP unit and the IACP unit; Above-mentioned DHCP unit also can be arranged in different physical entities with the IACP unit, and at this moment, server device can specifically comprise the affiliated physical entity of physical entity and IACP unit under the DHCP unit.The concrete function of above-mentioned DHCP unit and IACP unit and flow process are used can be specifically referring to following embodiment.

Wherein, the IP address that has disposed is meant the IP address of adopting the DHCP mode to obtain, perhaps, and the IP address that the mode of employing human configuration obtains, the IP address of perhaps adopting other the dynamic IP addressing method of salary distribution to obtain, the IP address that this has disposed is the IP address on the ordinary meaning in the communication system.And temporary ip address is interim IP address of adopting in order to obtain formal IP address.

Wherein, when system did not carry out VLAN planning, this communication range was a certain network segment; When system carried out VLAN planning, this communication range was a certain VLAN of a certain network segment.

Step 12: this server device sends relaying configuration Indication message to this client computer with formal IP address, carries the DHCP configuration information in this relaying configuration Indication message.

Step 13: after client configuration that this client computer with formal IP address has this according to this DHCP configuration information formal IP address becomes the DHCP relay device, this server device is by being configured to the client computer of DHCP relay device, for the client computer of this formal IP to be configured address is distributed formal IP address.

Present embodiment becomes the DHCP relay device by the client configuration with formal IP address, can need not to be provided with special-purpose DHCP relay device in network system when adopting the DHCP configuration of IP address, realizes the reduction of network input and maintenance cost.

Fig. 2 is the method flow schematic diagram of second embodiment of the invention, comprising:

Step 21: the client computer that has had formal IP address receives the relaying configuration Indication message that server device sends, carry the DHCP configuration information in this relaying configuration Indication message, this client computer that has had the client computer of formal IP address and formal IP to be configured address is in same communication range;

Step 22: this client computer that has had formal IP address is configured to the DHCP relay device according to this DHCP configuration information with this machine;

Step 23: the client computer that is configured to the DHCP relay device provides dhcp relay feature, realizes that this server device distributes formal IP address for the client computer of this formal IP to be configured address.

Further, present embodiment can also comprise: this client computer that has had formal IP address also comprised the step of obtaining formal IP address before having formal IP address; After obtaining formal IP address, this server device sends formal IP address Indication message, and this server device sends this relaying configuration Indication message after receiving this formal IP address Indication message.

Wherein, this client computer is obtained formal IP address and is comprised:

This client computer receives the detection packet that this server device sends, and carries the IP address of the gateway of temporary ip address, this communication range, the IP address of server device and the netmask of this communication range in this detection packet; This client computer is according to the IP address of the gateway of this temporary ip address, this communication range, the IP address of server device and the netmask of this communication range, send clean culture DHCP request to this server device, receive this server device formal IP address that request distributes for this client computer according to this clean culture DHCP.

The embodiment of the invention is mainly based on following thinking: when DHCP client computer and Dynamic Host Configuration Protocol server during not at the same network segment, the smooth distribution for the IP address needs the DHCP relay device in the system.And if the special-purpose DHCP relay device that special use is set can increase cost, in order to address this problem, the embodiment of the invention is not provided with special-purpose DHCP relay device, but the client configuration that will have formal IP address becomes the DHCP relay device, after having the DHCP relay device, just can adopt existing dhcp process to carry out the distribution of formal IP address.Further, owing in the above-mentioned process that is configured to the DHCP relay device, need to have the client computer of formal IP address, and may initially not have any client computer in this communication range with formal IP address, at this moment, need at first to distribute formal IP address, so that this has distributed the client computer of formal IP address can be configured to the DHCP relay device at least one client computer in this communication range.The embodiment of the invention is to distribute formal IP address by at least one client computer that temporary ip address is embodied as in this communication range, and temporary ip address is to adopt the IACP process to realize.

The idiographic flow of IACP can followingly be realized:

At first, client is obtained the IP message that comprises unallocated IP address.For example, when this client and IP address assignment server during not at the same network segment, this client receives the first ARP request package that the couple in router of this client place network segment sends; Or when this client and IP address assignment server during at the same network segment, this client receives the 2nd ARP request package that this IP address assignment server sends.

Next, whether the unallocated IP address that client is surveyed in the IP message that gets access to is occupied.For example, other nodes to this network segment send the probe message that comprises unallocated IP address; Whether the response message of replying according to other nodes of this network segment is surveyed this unallocated IP address occupied.

Once more, occupied if unallocated IP address does not have, then judge whether to obtain this unallocated IP address, if the unallocated IP address client that then obtains this is obtained the IP message that comprises unallocated IP address by this client.For example, the comparison information of the gratuitous ARP request package carrying that sends according to other clients that receive judges whether to be obtained by this client this unallocated IP address.

Wherein, why selection has the client computer of formal IP address, is that server device could be according to normal IP process and client computer interactive information because have only client computer after having formal IP address, for example, just relaying can be disposed Indication message and send to client computer.

Wherein, in server device, can preserve the DHCP configuration information in advance, and a certain equipment can have the function of DHCP relay device after being configured according to this DHCP configuration information.Therefore, when server device sent to client computer with the DHCP configuration information, this client computer that receives DHCP can be configured to Dynamic Host Configuration Protocol server with self according to this DHCP configuration information.The content of concrete DHCP configuration information can obtain from the existing needed DHCP configuration information of DHCP relay device, not in the concern scope of the embodiment of the invention.

From foregoing as can be known, the embodiment of the invention may need IACP process and dhcp process, and therefore, in this case, client and service end need to have simultaneously IACP function and DHCP function respectively.For this reason, among the following embodiment, client computer can be for having the client computer of IACP function and DHCP function.And in service end, the unit with IACP function can be arranged in the same physical entity with the unit with DHCP function, and at this moment, server device is the server with IACP function and DHCP function; Perhaps, the unit with IACP function also can be arranged in the different physical entities with the unit with DHCP function, and at this moment, server device comprises IACP server with IACP function and the Dynamic Host Configuration Protocol server with DHCP function.Following embodiment will be respectively with IACP function and DHCP function setting in same physical entity, the IACP function is that example describes in different physical entities with the DHCP function setting.

Can also know that from foregoing network system can not carried out VLAN planning, at this moment, communication range is meant the network segment; Also can carry out VLAN planning, this moment, communication range was the VLAN under the network segment and this network segment.Following embodiment will be that example describes not carry out VLAN planning, to carry out the VLAN rule respectively.

Fig. 3 is the method flow schematic diagram of third embodiment of the invention, and present embodiment to be carrying out VLAN planning, and IACP function and DHCP function setting are example in same physical entity.

Fig. 4 is the network architecture schematic diagram of third embodiment of the invention correspondence, referring to Fig. 4, the client computer 41 that comprises at least one, this client computer is by Ethernet (Ethernet) 42 and router four 3, communicate by letter with IACP+DHCP server 44, this IACP+DHCP server 44 can have IACP function and DHCP function.Present embodiment need be in the network segment under the client computer of formal IP to be allocated address, the configuration DHCP repeater.

If do not specify in the present embodiment, the network segment is meant the affiliated network segment of client computer of formal IP to be allocated address.

Referring to Fig. 3, present embodiment comprises:

Behind the step 301:IACP+DHCP startup of server, judge whether the client computer of IACP+DHCP server and formal IP to be allocated address belongs to the same network segment, if, execution in step 311, otherwise, execution in step 302.

Wherein, preserve the relevant information of client computer in the IACP+DHCP server, this relevant information comprises the network segment sign of the network segment under the client computer, and therefore, this IACP+DHCP server can be judged the client computer of IACP+DHCP server and formal IP to be allocated address whether in the same network segment.

Step 302:IACP+DHCP server judges in the affiliated network segment of the client computer of formal IP to be allocated address whether have available DHCP relay device, if, execution in step 310, otherwise, execution in step 303.

Particularly, the client computer with formal IP address in the network system can send the relay capabilities Indication message to the IACP+DHCP server, carries network segment sign and capability indication information in this relay capabilities Indication message.

Therefore, the IACP+DHCP server can carry out whether existing in this network segment the judgement of available DHCP relay device in the following way:

When the IACP+DHCP server receives the relay capabilities Indication message that client computer sends, the carrying capacity indication information and network segment sign in this relay capabilities Indication message, when showing the client computer that sends this relay capabilities Indication message, this capability indication information has relay capabilities, and this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when the same network segment, and this IACP+DHCP server obtains this network segment and has available DHCP relay device; Being understandable that " available DHCP relay device " here can be to have the DHCP relay device that the client configuration of formal IP address forms, perhaps, also may be DHCP relay device special-purpose in the prior art.

When this IACP+DHCP server does not receive this relay capabilities Indication message, perhaps, receive this relay capabilities Indication message but this capability indication information shows the client computer that sends this relay capabilities Indication message does not have relay capabilities, perhaps, receive this relay capabilities Indication message but this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when the same network segment, this IACP+DHCP server obtains not existing in this network segment available DHCP relay device.

Step 303:IACP+DHCP server judges whether there is the client computer with formal IP address in this network segment, if, execution in step 307, otherwise, execution in step 304.

Particularly, client computer in the network system is after startup, (for example be configured formal IP address, adopt human configuration mode or DHCP configuration mode) client computer can send formal IP address Indication message to the IACP+DHCP server, carry network segment sign in this formal IP address Indication message.

Therefore, the IACP+DHCP server can carry out whether having in this network segment the judgement of the client computer of formal IP address in the following way:

When this IACP+DHCP server receives the formal IP address Indication message that carries network segment sign that client computer sends, and this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when the same network segment, and this IACP+DHCP server obtains the client computer that the interior existence of this network segment has been configured formal IP address;

When this IACP+DHCP server does not receive this formal IP address Indication message, perhaps, receive this formal IP address Indication message but this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when the same network segment, this IACP+DHCP server obtains not existing in this network segment the client computer that has been configured formal IP address.

It is that the interior interim client computer of this network segment is distributed temporary ip address that step 304:IACP+DHCP server adopts IACP.

Wherein, in the IACP process, the IACP server can be this network segment distributing IP address, in order to distinguish with the dhcp process IP address allocated, the IP address of IACP server-assignment is called temporary ip address, and the client computer that receives this temporary ip address is called interim client computer.

Particularly, IACP is the agreement of IACP server active to client configuration IP address.Behind the IACP startup of server, periodically send detection packet to destination network segment, wherein, the still unappropriated IP address that destination address in the detection packet is selected for the IACP server, also carry the IP address of the gateway in the destination network segment in the detection packet, the IP address of the netmask of destination network segment and IACP server.After gateway in the destination network segment receives this detection packet, to the destination network segment broadcast request, after client computer receives this request package, receive the IP address that this IACP server is selected by client computer of client computer election of unallocated IP address still, the client computer that is elected by this quilt receives the detection packet that the IACP server sends afterwards, obtains the IP address of IACP server-assignment.

Step 305: interim client computer adopts the clean culture dhcp process according to the IP address of IP address, netmask and the IACP+DHCP server of the temporary ip address in the detection packet, gateway, obtains formal IP address from the IACP+DHCP server.

Particularly, when interim client computer is known self and IACP+DHCP server at the same network segment according to netmask, can be according to the IP address of IACP+DHCP server, send DHCP search bag to the IACP+DHCP server, the IACP+DHCP server receives DHCP search bag back and distributes formal IP address, carries out normal DHCP flow process.When interim client computer is known self and IACP+DHCP server not at the same network segment according to netmask, can be according to the IP address of gateway and the IP address of IACP+DHCP server, send DHCP search bag by gateway to the IACP+DHCP server, the IACP+DHCP server receives DHCP search bag back and distributes formal IP address, carries out normal DHCP flow process.

After interim client computer was obtained formal IP address, interim client computer can discharge temporary ip address, and the IACP+DHCP server can reclaim temporary ip address, and like this, follow-up this temporary ip address still can be used again.

Step 306: the client computer with formal IP address sends formal IP address Indication message to the IACP+DHCP server, carries network segment sign in this formal IP address Indication message.

Afterwards, can repeated execution of steps 303.

Be understandable that after interim client computer was obtained formal IP address, this interim client computer was also for having the client computer of formal IP address.

Step 307:IACP+DHCP server sends relaying configuration Indication message to the client computer with formal IP address, carries the DHCP configuration information in this relaying configuration Indication message.

Step 308: the client computer with formal IP address will self be configured to available DHCP relay device according to the DHCP configuration information.

Afterwards, can repeated execution of steps 302.

Step 309: available DHCP relay device sends the relay capabilities Indication message to the IACP+DHCP server, the carrying capacity indication information and network segment sign in this relay capabilities Indication message.

Be understandable that after the client computer with formal IP address was configured to available DHCP relay device, this client computer with formal IP address also was available DHCP relay device.

Step 310:IACP+DHCP server is by available DHCP relay device, for the client computer of formal IP to be allocated address is distributed formal IP address.

Particularly, owing to had the DHCP relay device in the network system, therefore, can be according to normal DHCP flow process distributing IP address.

Step 311:IACP+DHCP server directly distributes formal IP address for the client computer of formal IP to be configured address.

Particularly, because the client computer of IP to be allocated address and IACP+DHCP server be in the same network segment, therefore, can be according to normal DHCP flow process distributing IP address.

The technical scheme of present embodiment becomes the DHCP relay device by the client configuration that will have formal IP address, can need not to be provided with special-purpose DHCP relay device in network system when adopting the DHCP configuration of IP address, realizes the reduction of network input and maintenance cost;

Further, present embodiment adopts network segment sign when carrying out correlated judgment, go for the scene that network system is not carried out VLAN planning;

In addition, the address of carrying the IACP+DHCP server in the detection packet of present embodiment in the IACP process goes for DHCP function and IACP function and synthesizes scene at same physical entity.

Fig. 5 is the method flow schematic diagram of fourth embodiment of the invention, and present embodiment is planned not carry out VLAN, and the IACP function is example in different physical entities with the DHCP function setting.

Fig. 6 is the network architecture schematic diagram of fourth embodiment of the invention correspondence, referring to Fig. 6, the client computer 61 that comprises at least one, this client computer 61 is by Ethernet (Ethernet) 62 and router 63, communicate by letter with IACP server 64 and Dynamic Host Configuration Protocol server 65, this IACP server 64 has the IACP function, and this Dynamic Host Configuration Protocol server 65 has the DHCP function.Present embodiment need be in the network segment under the client computer of formal IP to be allocated address, the configuration DHCP repeater.

Referring to Fig. 5, present embodiment comprises:

Step 501: judgment device judges whether the client computer of Dynamic Host Configuration Protocol server and formal IP to be allocated address belongs to the same network segment, if, execution in step 511, otherwise, execution in step 502.

Wherein, judgment device can be the functional module in the server device, and this judgment device can be arranged in the IACP server, perhaps, is arranged in Dynamic Host Configuration Protocol server, perhaps, independently is arranged on outside IACP server and the Dynamic Host Configuration Protocol server.Being arranged in the IACP server with judgment device among Fig. 5 is example.

Wherein, preserve the relevant information of client computer in the judgment device, this relevant information comprises the network segment sign of the network segment under the client computer, and therefore, this judgment device can be judged the client computer of Dynamic Host Configuration Protocol server and formal IP to be allocated address whether in the same network segment.

Step 502: judgment device judges in the affiliated network segment of the client computer of formal IP to be allocated address whether have available DHCP relay device, if, execution in step 510, otherwise, execution in step 503.

Particularly, the client computer with formal IP address in the network system can send the relay capabilities Indication message to judgment device, carries network segment sign and capability indication information in this relay capabilities Indication message.

Therefore, judgment device can carry out whether existing in this network segment the judgement of available DHCP relay device in the following way:

When judgment device receives the relay capabilities Indication message that client computer sends, the carrying capacity indication information and network segment sign in this relay capabilities Indication message, when showing the client computer that sends this relay capabilities Indication message, this capability indication information has relay capabilities, and this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when the same network segment, and this judgment device obtains this network segment and has available DHCP relay device; Being understandable that " available DHCP relay device " here can be to have the DHCP relay device that the client configuration of formal IP address forms, perhaps, also may be DHCP relay device special-purpose in the prior art.

When this judgment device does not receive this relay capabilities Indication message, perhaps, receive this relay capabilities Indication message but this capability indication information shows the client computer that sends this relay capabilities Indication message does not have relay capabilities, perhaps, receive this relay capabilities Indication message but this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when the same network segment, this judgment device obtains not existing in this network segment available DHCP relay device.

Step 503: judgment device judges whether there is the client computer with formal IP address in this network segment, if, execution in step 507, otherwise, execution in step 504.

Particularly, client computer in the network system is after startup, the client computer that has been configured formal IP address (for example, adopting human configuration mode or DHCP configuration mode) can send formal IP address Indication message to judgment device, carries network segment sign in this formal IP address Indication message.

Therefore, judgment device can carry out whether having in this network segment the judgement of the client computer of formal IP address in the following way:

When this judgment device receives the formal IP address Indication message that carries network segment sign that client computer sends, and this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when the same network segment, and this judgment device obtains the client computer that the interior existence of this network segment has been configured formal IP address;

When this judgment device does not receive this formal IP address Indication message, perhaps, receive this formal IP address Indication message but this network segment sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when the same network segment, this judgment device obtains not existing in this network segment the client computer that has been configured formal IP address.

Step 504: after judgment device triggered the IACP startup of server, it was that the interior interim client computer of this network segment is distributed temporary ip address that the IACP server adopts IACP.

Be arranged because present embodiment IACP server and Dynamic Host Configuration Protocol server divide, therefore, the address of service end is the IP address of IACP server and the IP address of Dynamic Host Configuration Protocol server in the detection packet in the present embodiment, and all the other contents specifically can be referring to step 304.

Step 505: interim client computer adopts the clean culture dhcp process according to the IP address of IP address, netmask and the Dynamic Host Configuration Protocol server of the temporary ip address in the detection packet, gateway, obtains formal IP address from Dynamic Host Configuration Protocol server.

Particularly, when interim client computer is known self and Dynamic Host Configuration Protocol server at the same network segment according to netmask, can be according to the IP address of Dynamic Host Configuration Protocol server, send DHCP search bag to Dynamic Host Configuration Protocol server, Dynamic Host Configuration Protocol server receives DHCP search bag back and distributes formal IP address, carries out normal DHCP flow process.When interim client computer is known self and Dynamic Host Configuration Protocol server not at the same network segment according to netmask, can be according to the IP address of gateway and the IP address of Dynamic Host Configuration Protocol server, send DHCP search bag by gateway to Dynamic Host Configuration Protocol server, Dynamic Host Configuration Protocol server receives DHCP search bag back and distributes formal IP address, carries out normal DHCP flow process.

After interim client computer was obtained formal IP address, interim client computer can discharge temporary ip address, and Dynamic Host Configuration Protocol server can reclaim temporary ip address, and like this, follow-up this temporary ip address still can be used again.

Step 506: the client computer with formal IP address sends formal IP address Indication message to judgment device, carries network segment sign in this formal IP address Indication message.

Afterwards, can repeated execution of steps 503.

Step 507: judgment device sends relaying configuration Indication message to the client computer with formal IP address, carries the DHCP configuration information in this relaying configuration Indication message.

Step 508: the client computer with formal IP address will self be configured to available DHCP relay device according to the DHCP configuration information.

Afterwards, can repeated execution of steps 502.

Step 509: available DHCP relay device sends the relay capabilities Indication message to the IACP+DHCP server, the carrying capacity indication information and network segment sign in this relay capabilities Indication message.

Step 510: after judgment device triggered the Dynamic Host Configuration Protocol server startup, Dynamic Host Configuration Protocol server was by available DHCP relay device, for the client computer of formal IP to be allocated address is distributed formal IP address.

Step 511: after judgment device triggered the Dynamic Host Configuration Protocol server startup, Dynamic Host Configuration Protocol server directly distributed formal IP address for the client computer of formal IP to be configured address.

Particularly, because the client computer of IP to be allocated address and Dynamic Host Configuration Protocol server be in the same network segment, therefore, can be according to normal DHCP flow process distributing IP address.

In addition, the address of carrying IACP server and Dynamic Host Configuration Protocol server in the detection packet of present embodiment in the IACP process goes for the scene that DHCP function and IACP functional separation are arranged at different physical entities.

Fig. 7 is the method flow schematic diagram of fifth embodiment of the invention, and present embodiment to be carrying out VLAN planning, and IACP function and DHCP function setting are example in same physical entity.

Fig. 8 is the network architecture schematic diagram of fifth embodiment of the invention correspondence, referring to Fig. 8, comprises the client computer 81 of at least one, exists under the situation of a plurality of client computer 81, supposes to be in the different VLAN.This client computer 81 is communicated by letter with IACP+DHCP server 84 by Ethernet (Ethernet) 82 and router 83, and this IACP+DHCP server 84 can have IACP function and DHCP function.Present embodiment need be under the client computer of formal IP to be allocated address in the affiliated VLAN of the network segment, the configuration DHCP repeater.

If do not specify in the present embodiment, VLAN is meant the affiliated VLAN of the affiliated network segment of client computer of formal IP to be allocated address.

Referring to Fig. 7, present embodiment comprises:

Behind the step 701:IACP+DHCP startup of server, judge whether the client computer of IACP+DHCP server and formal IP to be allocated address belongs to the same network segment, if, execution in step 711, otherwise, execution in step 702.

Step 702:IACP+DHCP server judges in the affiliated VLAN of the network segment under the client computer of formal IP to be allocated address whether have available DHCP relay device, if, execution in step 710, otherwise, execution in step 703.

Particularly, the client computer with formal IP address in the network system can send the relay capabilities Indication message to the IACP+DHCP server, carries network segment sign and VLAN sign (network segment sign+VLAN sign) and capability indication information in this relay capabilities Indication message.

Therefore, the IACP+DHCP server can carry out whether existing in this VLAN the judgement of available DHCP relay device in the following way:

When the IACP+DHCP server receives the relay capabilities Indication message that client computer sends, carrying capacity indication information and network segment sign+VLAN sign in this relay capabilities Indication message, when showing the client computer that sends this relay capabilities Indication message, this capability indication information has relay capabilities, and this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when same VLAN, and this IACP+DHCP server obtains this VLAN and has available DHCP relay device; Being understandable that " available DHCP relay device " here can be to have the DHCP relay device that the client configuration of formal IP address forms, perhaps, also may be DHCP relay device special-purpose in the prior art.

When this IACP+DHCP server does not receive this relay capabilities Indication message, perhaps, receive this relay capabilities Indication message but this capability indication information shows the client computer that sends this relay capabilities Indication message does not have relay capabilities, perhaps, receive this relay capabilities Indication message but this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when same VLAN, this IACP+DHCP server obtains not existing in this VLAN available DHCP relay device.

Step 703:IACP+DHCP server judges whether there is the client computer with formal IP address in this VLAN, if, execution in step 707, otherwise, execution in step 704.

Particularly, client computer in the network system is after startup, (for example be configured formal IP address, adopt human configuration mode or DHCP configuration mode) client computer can send formal IP address Indication message to the IACP+DHCP server, carry network segment sign+VLAN in this formal IP address Indication message and identify.

When this IACP+DHCP server receives the formal IP address Indication message that carries network segment sign+VLAN sign that client computer sends, and this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when same VLAN, and this IACP+DHCP server obtains the client computer that the interior existence of this VLAN has been configured formal IP address;

When this IACP+DHCP server does not receive this formal IP address Indication message, perhaps, receive this formal IP address Indication message but this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when same VLAN, this IACP+DHCP server obtains not existing in this VLAN the client computer that has been configured formal IP address.

It is that the interior interim client computer of this VLAN is distributed temporary ip address that step 704:IACP+DHCP server adopts IACP.

Can adopt the realization flow of similar step 304 particularly, just the network segment in the step 304 need be replaced with the VLAN under the client computer of formal IP to be allocated address.Step 705: interim client computer adopts the clean culture dhcp process according to the IP address of IP address, netmask and the IACP+DHCP server of the temporary ip address in the detection packet, gateway, obtains formal IP address from the IACP+DHCP server.

Can adopt the realization flow of similar step 305 particularly, just the network segment in the step 305 need be replaced with the VLAN under the client computer of formal IP to be allocated address.

Step 706: the client computer with formal IP address sends formal IP address Indication message to the IACP+DHCP server, carries network segment sign+VLAN sign in this formal IP address Indication message.

Afterwards, can repeated execution of steps 703.

Step 707: identical with step 307.

Step 708: the client computer with formal IP address will self be configured to available DHCP relay device according to the DHCP configuration information.

Afterwards, can repeated execution of steps 702.

Step 709: available DHCP relay device sends the relay capabilities Indication message to the IACP+DHCP server, carrying capacity indication information and network segment sign+VLAN sign in this relay capabilities Indication message.

Step 710: identical with step 310.

Step 711:IACP+DHCP server directly distributes formal IP address for the client computer of formal IP to be configured address.

Particularly, because the client computer of IP to be allocated address and IACP+DHCP server be in the same VLAN of the same network segment, therefore, can be according to normal DHCP flow process distributing IP address.

Further, present embodiment adopts network segment sign+VLAN sign when carrying out correlated judgment, go for the scene that network system is carried out VLAN planning;

Fig. 9 is the method flow schematic diagram of sixth embodiment of the invention, and present embodiment is planned to carry out VLAN, and the IACP function is example in different physical entities with the DHCP function setting.

Figure 10 is the network architecture schematic diagram of sixth embodiment of the invention correspondence, referring to Figure 10, the client computer 101 that comprises at least one, this client computer 101 is by Ethernet (Ethernet) 102, perhaps, further, communicate by letter with IACP server 104 and Dynamic Host Configuration Protocol server 105 by gateway 103, this IACP server 104 has the IACP function, and this Dynamic Host Configuration Protocol server 105 has the DHCP function.Present embodiment need be in the network segment under the client computer of formal IP to be allocated address, the configuration DHCP repeater.

Referring to Fig. 9, present embodiment comprises:

Behind the step 901:DHCP startup of server, judgment device judges whether the client computer of Dynamic Host Configuration Protocol server and formal IP to be allocated address belongs to the same network segment, if, execution in step 911, otherwise, execution in step 902.

Wherein, judgment device is the functional module in the server device, and this judgment device can be arranged in the IACP server, perhaps, is arranged in Dynamic Host Configuration Protocol server, perhaps, independently is arranged on outside IACP server and the Dynamic Host Configuration Protocol server.

Step 902: judgment device judges in the affiliated VLAN of the network segment under the client computer of formal IP to be allocated address whether have available DHCP relay device, if, execution in step 910, otherwise, execution in step 903.

Particularly, the client computer with formal IP address in the network system can send the relay capabilities Indication message to judgment device, carries network segment sign+VLAN sign and capability indication information in this relay capabilities Indication message.

When judgment device receives the relay capabilities Indication message that client computer sends, carrying capacity indication information and network segment sign+VLAN sign in this relay capabilities Indication message, when showing the client computer that sends this relay capabilities Indication message, this capability indication information has relay capabilities, and this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when same VLAN, and this judgment device obtains this VLAN and has available DHCP relay device; Being understandable that " available DHCP relay device " here can be to have the DHCP relay device that the client configuration of formal IP address forms, perhaps, also may be DHCP relay device special-purpose in the prior art.

When this judgment device does not receive this relay capabilities Indication message, perhaps, receive this relay capabilities Indication message but this capability indication information shows the client computer that sends this relay capabilities Indication message does not have relay capabilities, perhaps, receive this relay capabilities Indication message but this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when same VLAN, this judgment device obtains not existing in this VLAN available DHCP relay device.

Step 903: judgment device judges whether there is the client computer with formal IP address in this VALN, if, execution in step 907, otherwise, execution in step 904.

Particularly, client computer in the network system is after startup, (for example be configured formal IP address, adopt human configuration mode or DHCP configuration mode) client computer can send formal IP address Indication message to judgment device, carry network segment sign+VLAN in this formal IP address Indication message and identify.

When this judgment device receives the formal IP address Indication message that carries network segment sign+VLAN sign that client computer sends, and this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address when same VLAN, and this judgment device obtains the client computer that the interior existence of this VLAN has been configured formal IP address;

When this judgment device does not receive this formal IP address Indication message, perhaps, receive this formal IP address Indication message but this network segment sign+VLAN sign shows the client computer of the client computer that sends this formal IP address Indication message and this formal IP to be configured address not when same VLAN, this judgment device obtains not existing in this VLAN the client computer that has been configured formal IP address.

Step 904: after judgment device triggered the IACP startup of server, it was that the interior interim client computer of this VLAN is distributed temporary ip address that the IACP server adopts IACP.

Can adopt the realization flow of similar step 504 particularly, just the network segment in the step 504 need be replaced with the VLAN under the client computer of formal IP to be allocated address.

Step 905: interim client computer adopts the clean culture dhcp process according to the IP address of IP address, netmask and the Dynamic Host Configuration Protocol server of the temporary ip address in the detection packet, gateway, obtains formal IP address from Dynamic Host Configuration Protocol server.

Can adopt the realization flow of similar step 505 particularly, just the network segment in the step 505 need be replaced with the VLAN under the client computer of formal IP to be allocated address.

Step 906: the client computer with formal IP address sends formal IP address Indication message to judgment device, carries network segment sign in this formal IP address Indication message.

Afterwards, can repeated execution of steps 803.

Step 907: identical with step 507.

Step 908: the client computer with formal IP address will self be configured to available DHCP relay device according to the DHCP configuration information.

Afterwards, can repeated execution of steps 902.

Step 909: available DHCP relay device sends the relay capabilities Indication message to the IACP+DHCP server, carrying capacity indication information and network segment sign+VLAN sign in this relay capabilities Indication message.

Step 910: identical with step 510.

Step 911:IACP+DHCP server directly distributes formal IP address for the client computer of formal IP to be configured address.

Particularly, because the client computer of IP to be allocated address and IACP+DHCP server be in the same VLAN of the same network segment, therefore, can be according to normal DHCP flow process distributing IP address.The technical scheme of present embodiment becomes the DHCP relay device by the client configuration that will have formal IP address, can need not to be provided with special-purpose DHCP relay device in network system when adopting the DHCP configuration of IP address, realizes the reduction of network input and maintenance cost;

Figure 11 is the server device structural representation of seventh embodiment of the invention, comprises client computer determination module 111, sending module 112 and distribution module 113.

Client computer determination module 111 is used for determining to have the client computer of formal IP address in the communication range under the client computer of formal IP to be configured address, the IP address of this formal IP address for having disposed; Sending module 112 is used for sending relaying configuration Indication message to this client computer with formal IP address, carries the DHCP configuration information in this relaying configuration Indication message; Distribution module 113 is used for after client configuration that this client computer with formal IP address has this according to this DHCP configuration information formal IP address becomes the DHCP relay device, by being configured to the client computer of DHCP relay device, for the client computer of this formal IP to be configured address is distributed formal IP address.

Further, present embodiment can also comprise first judge module, 114, the first judge modules 114 are used to judge whether have the client computer that has been configured formal IP address in this communication range;

Wherein, client computer determination module 111 can comprise the first module 1111 and/or second unit 1112; First module 1111 is used for when the judged result of this first judge module 114 has been configured the client computer of formal IP address for existence in this communication range, receive the formal IP address Indication message that this client computer that has been configured formal IP address sends, the client computer that sends this formal IP address Indication message is defined as having the client computer of formal IP address; Second unit 1112 is used for when not having the client computer that has been configured formal IP address in this communication range, distributes temporary ip address, and the client configuration that will be assigned to this temporary ip address becomes to have the client computer of formal IP address.

Particularly, second unit 1112 can comprise IACP unit 1113 and DHCP unit 1114, IACP unit 1113 is used for sending detection packet in this communication range, carry the IP address of the gateway of temporary ip address, this communication range, the IP address of server device and the netmask of this communication range in this detection packet, this temporary ip address is configured to consult definite interim client computer to the client computer in this communication range; DHCP unit 1114 is used to receive the clean culture DHCP request that this interim client computer sends, and distribute formal IP address for this interim client computer according to this clean culture DHCP request, interim client computer behind the formal IP of the distribution address is confirmed as having the client computer of formal IP address, accordingly, aforementioned clean culture DHCP request is that this interim client computer sends according to the IP address of the gateway of this temporary ip address, this communication range, the IP address of server device and the netmask of this communication range.

Wherein, this IACP unit 1113 and the DHCP unit 1114 in the present embodiment can be arranged in same physical entity; At this moment, the IP address of the server device of these IACP unit 1113 transmissions is the IP address of this physical entity.Perhaps, this IACP unit 1113 of present embodiment also can be arranged in different physical entities with DHCP unit 1114, at this moment, the IP address of the server device that sends of this IACP unit 1113 comprises the IP address of the physical entity under this IACP unit 1113 and the IP address of the physical entity under this DHCP unit 1114.

Further, present embodiment can also comprise second judge module, 115, the second judge modules 115 are used to judge whether have available DHCP relay device in this communication range; This first judge module 114 specifically is used for judging whether there is the client computer that has been configured formal IP address in this communication range when 115 judgements of this second judge module obtain not having available DHCP relay device in this communication range.Further, present embodiment can also comprise that the 3rd judge module 116, the three judge modules 116 are used for judging that whether the client computer of this server device and this formal IP to be configured address is at the same network segment; This second judge module 115 specifically is used for judging when the 3rd judge module 116 client computer that obtains this server device and this IP to be configured address during not at the same network segment, judges whether there is available DHCP relay device in this communication range.

Present embodiment becomes the DHCP relay device by the client configuration that will have formal IP address, can need not to be provided with special-purpose DHCP relay device in network system when adopting the DHCP configuration of IP address, realizes the reduction of network input and maintenance cost; Carry the address of physical entity under IACP unit and the DHCP unit in the detection packet of present embodiment in the IACP process, go for DHCP function and IACP function and synthesize at same physical entity or separately in the scene of different physical entities.

Figure 12 is the client architecture schematic diagram of eighth embodiment of the invention, comprises receiver module 121, configuration module 122 and trunk module 123.

Receiver module 121 is used to receive the relaying configuration Indication message that server device sends, and carries the DHCP configuration information in this relaying configuration Indication message; Configuration module 122 is used for according to this DHCP configuration information this machine being configured to the DHCP relay device; Trunk module 123 is used to provide dhcp relay feature, realizes that this server device is that the client computer of formal IP to be configured address is distributed formal IP address.

Further, present embodiment can also comprise address acquisition module 124 and indicating module 125, and address acquisition module 124 is used to obtain formal IP address; Indicating module 125 is used for after obtaining formal IP address, sends formal IP address Indication message to this server device, and is corresponding, and aforementioned relaying configuration Indication message sends after receiving this formal IP address Indication message for this server device.

Wherein, this address acquisition module 124 can comprise the 3rd unit 1241 and the 4th unit 1242, the 3rd unit 1241 is used to receive the detection packet that this server device sends, and carries the IP address of the gateway of temporary ip address, this communication range, the IP address of server device and the netmask of this communication range in this detection packet; The 4th unit 1242 is used for according to the IP address of the IP address of the gateway of this temporary ip address, this communication range, server device and the netmask of this communication range, send clean culture DHCP request to this server device, receive this server device formal IP address that request distributes according to this clean culture DHCP.

Wherein, client computer is carried network segment sign when server sends correlated judgment information, perhaps, and network segment sign and VLAN sign.That is, when not planning VLAN, what need to judge is: whether the client computer of this client computer of present embodiment and this formal IP to be configured address is in the same network segment; When planning VLAN, what need judgement is: the client computer of this client computer of present embodiment and this formal IP to be configured address is in the same VLAN of the same network segment.

Present embodiment becomes the DHCP relay device by the client configuration that will have formal IP address, can need not to be provided with special-purpose DHCP relay device in network system when adopting the DHCP configuration of IP address, realizes the reduction of network input and maintenance cost; Present embodiment adopts network segment sign or network segment sign and VLAN sign when carrying out correlated judgment, go for the scene that network system is not carried out VLAN planning or carried out VLAN planning.

Figure 13 is the communication system architecture schematic diagram of ninth embodiment of the invention, comprises server device 131 and client computer 132, and wherein, server device 131 can be as shown in figure 11, and client computer 132 can be as shown in figure 12.In addition, about the specific descriptions of server device and client computer, can be referring to relevant apparatus embodiments and/or method embodiment.

In addition, about server device and client computer embodiment, also can be referring to correlation technique embodiment, that is, and flow process or the function of the equipment that apparatus embodiments provides in can implementation method embodiment.

One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can be finished by the relevant hardware of program command, aforesaid program can be stored in the computer read/write memory medium, this program is carried out the step that comprises said method embodiment when carrying out; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CD.

It should be noted that at last: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of various embodiments of the present invention technical scheme.

Claims

1. an IP address automatic distributing method is characterized in that, comprising:

In the communication range of server device under the client computer of formal IP to be configured address, determine to have the client computer of formal IP address, the IP address of described formal IP address for having disposed;

Described server device sends relaying configuration Indication message to described client computer with formal IP address, carries the dynamic host configuration protocol DHCP configuration information in the described relaying configuration Indication message;

After described client computer with formal IP address is configured to the DHCP relay device according to described DHCP configuration information with this machine, described server device is by being configured to the client computer of DHCP relay device, for the client computer of described formal IP to be configured address is distributed formal IP address.

2. method according to claim 1 is characterized in that, also comprises:

Described server device judges whether there is the client computer that has been configured formal IP address in the described communication range;

When the result of described judgement had been configured the client computer of formal IP address for existing in the described communication range, described server device determined that the client computer with formal IP address comprises:

Described server device receives the formal IP address Indication message that the described client computer that has been configured formal IP address sends, and the client computer that sends described formal IP address Indication message is defined as having the client computer of formal IP address;

And/or,

When the result of described judgement when not having the client computer that has been configured formal IP address in the described communication range, described server device determines that the client computer with formal IP address comprises:

Described server device is distributed temporary ip address, and the client configuration that will be assigned to described temporary ip address becomes to have the client computer of formal IP address.

3. method according to claim 2 is characterized in that, described server device judges whether exist the client computer that has been configured formal IP address to comprise in the described communication range:

When described server device receives the formal IP address Indication message that carries possible location that client computer sends, and described possible location shows the client computer of the client computer that sends described formal IP address Indication message and described formal IP to be configured address when same communication range, and described server device is judged and obtained the client computer that the interior existence of described communication range has been configured formal IP address;

And/or,

When described server device does not receive described formal IP address Indication message, perhaps, receive described formal IP address Indication message but described possible location shows the client computer of the client computer that sends described formal IP address Indication message and described formal IP to be configured address not when same communication range, described server device judgement obtains not existing in the described communication range client computer that has been configured formal IP address.

4. method according to claim 2 is characterized in that, described server device is distributed temporary ip address, and the client computer that the client configuration that will be assigned to described temporary ip address becomes to have formal IP address comprises:

Described server device sends detection packet in described communication range, carry the IP address of the gateway of temporary ip address, described communication range, the IP address of server device and the netmask of described communication range in the described detection packet, described temporary ip address is configured to consult definite interim client computer to the client computer in the described communication range;

Described server device receives the clean culture DHCP request that described interim client computer sends, and according to described clean culture DHCP request distributes formal IP address for described interim client computer, interim client computer behind the formal IP of the distribution address is defined as having the client computer of formal IP address, and described clean culture DHCP request is that described interim client computer sends according to the IP address of the gateway of described temporary ip address, described communication range, the IP address of server device and the netmask of described communication range.

5. method according to claim 4 is characterized in that,

Comprise the DHCP unit that is used to distribute the automatic address distributorship agreement IACP unit of temporary ip address and is used to distribute formal IP address when described server device, and when described IACP unit and DHCP unit were arranged in same physical entity, the IP address of described server device was the IP address of described physical entity;

Perhaps,

Comprise the DHCP unit that is used to distribute the IACP unit of temporary ip address and is used to distribute formal IP address when described server device, and when described IACP unit was arranged in different physical entities with the DHCP unit, the IP address of described server device comprised the IP address of the physical entity under the described IACP unit and the IP address of the physical entity under the described DHCP unit.

6. method according to claim 2 is characterized in that, also comprises:

Described server device judges whether there is available DHCP relay device in the described communication range;

When not having available DHCP relay device in the described communication range, described server device is carried out and is judged the operation that whether has the client computer that has been configured formal IP address in the described communication range.

7. method according to claim 6 is characterized in that, described server device judges whether exist available DHCP relay device to comprise in the described communication range:

When described server device receives the relay capabilities Indication message that client computer sends, carrying capacity indication information and possible location in the described relay capabilities Indication message, when showing the client computer that sends described relay capabilities Indication message, described capability indication information has relay capabilities, and described possible location shows the client computer of the client computer that sends described formal IP address Indication message and described formal IP to be configured address when same communication range, and described server device judgement obtains existing in the described communication range available DHCP relay device;

And/or,

When described server device does not receive described relay capabilities Indication message, perhaps, receive described relay capabilities Indication message but described capability indication information shows the client computer that sends described relay capabilities Indication message does not have relay capabilities, perhaps, receive described relay capabilities Indication message but described possible location shows the client computer of the client computer that sends described formal IP address Indication message and described formal IP to be configured address not when same communication range, described server device judgement obtains not existing in the described communication range available DHCP relay device.

8. method according to claim 6 is characterized in that, also comprises:

Described server device judges that the client computer of described server device and described formal IP to be configured address is whether in the same network segment;

When the client computer of described server device and described IP to be configured address was not in the same network segment, described server device was carried out and is judged the operation that whether has available DHCP relay device in the described communication range.

9. according to claim 3 or 7 described methods, it is characterized in that,

When not planning virtual LAN VLAN, described possible location is the network segment sign of the network segment under the client computer that sends described possible location; And/or,

When planning VLAN, described possible location is that the network segment of the affiliated network segment of client computer of the described possible location of transmission identifies and the VLAN of affiliated VLAN identifies.

10. an IP address automatic distributing method is characterized in that, comprising:

The client computer that has had formal IP address receives the relaying configuration Indication message that server device sends, carry the dynamic host configuration protocol DHCP configuration information in the described relaying configuration Indication message, the client computer of described client computer that has had formal IP address and formal IP to be configured address is in same communication range;

The described client computer that has had formal IP address is configured to the DHCP relay device according to described DHCP configuration information with this machine;

The client computer that is configured to the DHCP relay device provides dhcp relay feature, realizes that described server device is that the client computer of described formal IP to be configured address is distributed formal IP address.

11. method according to claim 10 is characterized in that, also comprises:

The described client computer that has had formal IP address also comprised the step of obtaining formal IP address before having formal IP address;

After obtaining formal IP address, send formal IP address Indication message to described server device, described relaying configuration Indication message is that described server device sends after receiving described formal IP address Indication message.

12. method according to claim 11 is characterized in that, the described step of obtaining formal IP address comprises:

Described client computer receives the detection packet that described server device sends, and carries the IP address of the gateway of temporary ip address, described communication range, the IP address of server device and the netmask of described communication range in the described detection packet;

Described client computer is according to the IP address of the gateway of described temporary ip address, described communication range, the IP address of server device and the netmask of described communication range, send clean culture DHCP request to described server device, receive the formal IP address that described server device is distributed for described client computer according to described clean culture DHCP request.

13. a server device is characterized in that, comprising:

The client computer determination module is used for determining to have the client computer of formal IP address in the communication range under the client computer of formal IP to be configured address, the IP address of described formal IP address for having disposed;

Sending module is used for sending relaying configuration Indication message to described client computer with formal IP address, carries the dynamic host configuration protocol DHCP configuration information in the described relaying configuration Indication message;

Distribution module, be used for after described client computer with formal IP address is configured to the DHCP relay device according to described DHCP configuration information with this machine, by being configured to the client computer of DHCP relay device, for the client computer of described formal IP to be configured address is distributed formal IP address.

14. equipment according to claim 13 is characterized in that, also comprises:

First judge module is used to judge whether have the client computer that has been configured formal IP address in the described communication range;

Described client computer determination module comprises: first module and/or Unit second;

The judged result that described first module is used for when described first judge module is when existence has been configured the client computer of formal IP address in the described communication range, receive the formal IP address Indication message that the described client computer that has been configured formal IP address sends, the client computer that sends described formal IP address Indication message is defined as having the client computer of formal IP address;

Described Unit second is used for when not having the client computer that has been configured formal IP address in the described communication range, distributes temporary ip address, and the client configuration that will be assigned to described temporary ip address becomes to have the client computer of formal IP address.

15. equipment according to claim 14 is characterized in that, described Unit second comprises:

Automatic address distributorship agreement IACP unit, be used in described communication range, sending detection packet, carry the IP address of the gateway of temporary ip address, described communication range, the IP address of server device and the netmask of described communication range in the described detection packet, described temporary ip address is configured to consult definite interim client computer to the client computer in the described communication range;

The DHCP unit, be used to receive the clean culture DHCP request that described interim client computer sends, and according to described clean culture DHCP request distributes formal IP address for described interim client computer, interim client computer behind the formal IP of the distribution address is defined as having the client computer of formal IP address, and described clean culture DHCP request is that described interim client computer sends according to the IP address of the gateway of described temporary ip address, described communication range, the IP address of server device and the netmask of described communication range.

16. equipment according to claim 15 is characterized in that,

Described IACP unit and DHCP unit are arranged in same physical entity; The IP address of the server device that described IACP unit sends is the IP address of described physical entity;

Perhaps,

Described IACP unit is arranged in different physical entities with the DHCP unit; The IP address of the server device that described IACP unit sends comprises the IP address of the physical entity under the described IACP unit and the IP address of the physical entity under the described DHCP unit.

17. equipment according to claim 14 is characterized in that, also comprises:

Second judge module is used to judge whether have available DHCP relay device in the described communication range;

Described first judge module specifically is used for judging whether there is the client computer that has been configured formal IP address in the described communication range when described second judge module judgement obtains not having available DHCP relay device in the described communication range.

18. equipment according to claim 17 is characterized in that, also comprises:

The 3rd judge module is used for judging that whether the client computer of described server device and described formal IP to be configured address is at the same network segment;

Described second judge module specifically is used for judging when described the 3rd judge module the client computer that obtains described server device and described IP to be configured address during not at the same network segment, judges whether there is available DHCP relay device in the described communication range.

19. a client computer is characterized in that, comprising:

Receiver module is used to receive the relaying configuration Indication message that server device sends, and carries the dynamic host configuration protocol DHCP configuration information in the described relaying configuration Indication message;

Configuration module is used for according to described DHCP configuration information this machine being configured to the DHCP relay device;

Trunk module is used to provide dhcp relay feature, realizes that described server device is that the client computer of formal IP to be configured address is distributed formal IP address.

20. client computer according to claim 19 is characterized in that, also comprises:

Address acquisition module is used to obtain formal IP address;

Indicating module is used for after obtaining formal IP address, sends formal IP address Indication message to described server device, and described relaying configuration Indication message is that described server device sends after receiving described formal IP address Indication message.

21. client computer according to claim 20 is characterized in that, described address acquisition module comprises:

Unit the 3rd is used to receive the detection packet that described server device sends, and carries the IP address of the gateway of temporary ip address, described communication range, the IP address of server device and the netmask of described communication range in the described detection packet;

Unit the 4th, be used for the IP address according to the gateway of described temporary ip address, described communication range, the IP address of server device and the netmask of described communication range, send clean culture DHCP request to described server device, receive the formal IP address that described server device is distributed according to described clean culture DHCP request.

22. a communication system is characterized in that, comprising:

As each described server device of claim 13-18;

And,

As each described client computer of claim 19-21.