CN102413203A - IP (Internet Protocol) address allocation method and device - Google Patents
IP (Internet Protocol) address allocation method and device Download PDFInfo
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- CN102413203A CN102413203A CN2011103932466A CN201110393246A CN102413203A CN 102413203 A CN102413203 A CN 102413203A CN 2011103932466 A CN2011103932466 A CN 2011103932466A CN 201110393246 A CN201110393246 A CN 201110393246A CN 102413203 A CN102413203 A CN 102413203A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L61/00—Network arrangements, protocols or services for addressing or naming
- H04L61/50—Address allocation
- H04L61/5007—Internet protocol [IP] addresses
- H04L61/5014—Internet protocol [IP] addresses using dynamic host configuration protocol [DHCP] or bootstrap protocol [BOOTP]
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Abstract
The invention discloses an IP (Internet Protocol) address allocation method and device. The method comprises the following steps: after a DHCP (dynamic host configuration protocol) relay receives a first DHCP detection message, judging whether it is necessary to acquire IP addresses from a DHCP server; if so, acquiring a plurality of IP addresses from the DHCP server and storing the IP addresses; and selecting an IP address from the IP addresses, and allocating the IP address to a client host which transmits the first DHCP detection message. The invention reduces the network flow between the DHCP relay and DHCP server in a DHCP network, and lowers the requirements for processing capacity of the DHCP server.
Description
Technical field
The present invention relates to the communications field, in particular to the distribution method and the device of a kind of IP address.
Background technology
DHCP (Dynamic Host Configure Protocol abbreviates DHCP as) is embodied as host assignment procotol (Internet Protocol abbreviates IP as) address and other network parameters, is a kind of dynamic-configuration agreement.
The DHCP agreement adopts user rs host-server (CLIENT-SERVER) mechanism, and whole layoutprocedure realizes that automatically all configuration informations are in Dynamic Host Configuration Protocol server (DHCP Server) centralized control.Use the rental period through configuration of IP address, can reach IP address multiplex effect.
Because under the default situations, router can not send to another subnet from a sub-net with the broadcast packet of receiving.And when Dynamic Host Configuration Protocol server and user rs host during not at same subnet, the router that serves as the user rs host default gateway must send to broadcast packet the subnet at Dynamic Host Configuration Protocol server place, and this function just is called DHCP relay (DHCP Relay).DHCP Relay has realized the transparent interaction between DHCP user rs host (DHCP CLIENT) and the Dynamic Host Configuration Protocol server (DHCP Server).
At present, the general employing of DHCP relay network topological project as shown in Figure 1.The DHCP user rs host realizes and the double layer intercommunication of DHCP Relay that through some two layers of transparent transmission networks DHCP Relay and DHCP Server realize that three layers of route can reach, and needs again the message encapsulation during DHCP message process DHCP Relay.In the network of DHCP Relay, whenever a DHCP user rs host is reached the standard grade once, DHCP Relay will accomplish a dhcp process with DHCP Server.
Fig. 2 is the flow chart according to the user rs host DHCP message interaction of correlation technique; As shown in Figure 2; A DHCP user rs host need be accomplished the acquisition of network parameter through twice exchange, through once accomplishing the process of re-renting alternately, accomplishes dispose procedure through once transmitting.When existing a large amount of DHCP user rs hosts to reach the standard grade; Message amount between DHCP Relay and the DHCP Server is with considerable; Take massive band width; Increase unnecessary network traffic, and bring unsafe factor to network, the message processing capability to DHCP Server also is a very big challenge simultaneously.
Summary of the invention
In correlation technique; In the DHCP relay network; Whenever a DHCP user rs host is reached the standard grade once, DHCP Relay need accomplish a dhcp process with DHCP Server, thereby increases the problem of the network traffics between DHCP Relay and the DHCP Server; The invention provides the distribution method and the device of a kind of IP address, to address the above problem at least.
According to an aspect of the present invention, a kind of IP is provided the distribution method of address, has comprised: DHCP relay judges whether and need obtain procotol IP address from Dynamic Host Configuration Protocol server after receiving first dynamic host configuration protocol DHCP discovery message; In judged result is under the situation that is, said DHCP relay obtains and store a plurality of IP address from said Dynamic Host Configuration Protocol server; From the said a plurality of IP address that obtains, select an IP address assignment to give the user rs host that sends said first dhcp discover message.
Preferably, be that said method also comprises under the situation not in said judged result: from local stored IP address, select an IP address assignment to give said user rs host.
Preferably, judge whether that obtaining procotol IP address from Dynamic Host Configuration Protocol server comprises: judge whether said DHCP relay stores the unallocated IP address of giving user rs host.
Preferably, be under the situation that is in judged result, obtain a plurality of IP address from Dynamic Host Configuration Protocol server and comprise: send second dhcp discover message to said Dynamic Host Configuration Protocol server; From the dhcp response message that said Dynamic Host Configuration Protocol server sends, obtain the said a plurality of IP of acquisition request address.
Preferably, from the dhcp response message that said Dynamic Host Configuration Protocol server sends, obtain after the said a plurality of IP of the acquisition request address, said method also comprises: send to said Dynamic Host Configuration Protocol server and carry the DHCP request message of said a plurality of IP address; Under the consistent situation in the IP address of sending with said DHCP, receive the DHCP acknowledge message of said Dynamic Host Configuration Protocol server transmission in said a plurality of IP address.
Preferably, receive after the DHCP acknowledge message of said Dynamic Host Configuration Protocol server transmission, said method also comprises: set up the user rs host information table, wherein, said user rs host information table is used to write down user rs host and is the corresponding relation of user rs host IP address allocated; After receiving the leave message of user rs host transmission, be released to said user rs host IP address allocated, delete the information of user rs host described in the said user rs host information table; Confirm that said Dynamic Host Configuration Protocol server is after service time of said a plurality of IP address of distributing of said DHCP relay reaching for the first preset rental period; Judge the information that whether also has user rs host in the said user rs host information table; In judged result is under the situation not, sends the DHCP release message to said Dynamic Host Configuration Protocol server, discharges said a plurality of IP address; In judged result is under the situation that is, re-rents said a plurality of IP address to said Dynamic Host Configuration Protocol server.
Preferably; After from the said a plurality of IP address that obtains, selecting the user rs host of an IP address assignment to said first dhcp discover message of transmission; Said method also comprises: when the second preset rental period arrived, judge whether to receive the leave message from said user rs host, if do not have; Then send notice to said user rs host; Notify said user rs host to re-rent the said IP address of from the said a plurality of IP address that obtains, selecting, wherein, the said first preset rental period is greater than the said second preset rental period.
According to another aspect of the present invention, a kind of IP is provided the distributor of address, has comprised: first judge module after being used to receive first dynamic host configuration protocol DHCP and finding message, judges whether and need obtain procotol IP address from Dynamic Host Configuration Protocol server; Acquisition module, being used in judged result is under the situation that is, obtains and store a plurality of IP address from said Dynamic Host Configuration Protocol server; Distribution module is used for selecting an IP address assignment to give the user rs host that sends said first dhcp discover message from the said a plurality of IP address that obtains.
Preferably, said distribution module also is used for: in said judged result is under the situation not, from local stored IP address, selects an IP address assignment to give said user rs host.
Preferably, said acquisition module comprises: transmitting element is used for sending second dhcp discover message to said Dynamic Host Configuration Protocol server; Acquiring unit is used for obtaining the said a plurality of IP of acquisition request address from the dhcp response message that said Dynamic Host Configuration Protocol server sends.
Preferably, said device also comprises: sending module is used for carrying the DHCP request message of said a plurality of IP address to said Dynamic Host Configuration Protocol server transmission; Receiver module under the consistent situation in the IP address that is used for sending with said Dynamic Host Configuration Protocol server in said a plurality of IP address, receives the DHCP acknowledge message of said Dynamic Host Configuration Protocol server transmission.
Preferably, said device also comprises: set up module, be used to receive said DHCP acknowledge message after, set up the user rs host information table, wherein, said user rs host information table can write down user rs host and be the corresponding relation of user rs host IP address allocated; Release module is used for after the leave message that receives the user rs host transmission, being released to said user rs host IP address allocated, deletes the information of user rs host described in the said user rs host information table; Determination module is used for judging that the IP address of DHCP relay reaches the preset rental period service time; Second judge module is used for judging whether said user rs host information table also has the information of user rs host; Said sending module, the judged result that also is used at said second judge module is under the situation not, sends the DHCP release message to said Dynamic Host Configuration Protocol server, discharges local all IP addresses of storing; Re-rent module, the judged result that is used at said second judge module is under the situation that is, re-rents said a plurality of IP address to said Dynamic Host Configuration Protocol server.
Through the present invention, DHCP Relay can lead to message interaction one time, applies for a plurality of IP address to DHCP Server, realizes the batch application of IP address and network parameter.When user rs host is reached the standard grade; DHCP Relay can distribute the IP address that from DHCP Server, obtains for user rs host; And needn't when each user rs host is reached the standard grade, all apply for the IP address, thereby the network traffics between DHCP Relay and the DHCP Server have been reduced to DHCP Server.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the sketch map according to the DHCP relay network of network topology of correlation technique;
Fig. 2 is the flow chart according to the user rs host DHCP message interaction of correlation technique;
Fig. 3 is the flow chart according to the distribution method of the IP address of the embodiment of the invention;
Fig. 4 be according to the preferred embodiment of the invention DHCP Relay to the flow chart of DHCP Discover message processing method;
Fig. 5 be according to the preferred embodiment of the invention DHCP Server to the flow chart of DHCP Discover message processing method;
Fig. 6 be according to the preferred embodiment of the invention DHCP Relay to the flow chart of DHCP Offer message processing method;
Fig. 7 be according to the preferred embodiment of the invention DHCP Server to the flow chart of DHCP Request message processing method;
Fig. 8 be according to the preferred embodiment of the invention DHCP Relay to the flow chart of DHCPACK message processing method;
Fig. 9 be according to the preferred embodiment of the invention DHCP Relay to the flow chart of DHCP Release message processing method;
Figure 10 is the structured flowchart according to the distributor of the IP address of the embodiment of the invention;
Figure 11 is the structured flowchart according to the distributor of a kind of preferred IP address of the embodiment of the invention.
Embodiment
Hereinafter will and combine embodiment to specify the present invention with reference to accompanying drawing.Need to prove that under the situation of not conflicting, embodiment and the characteristic among the embodiment among the application can make up each other.
In correlation technique; In the DHCP relay network, whenever a DHCP user rs host is reached the standard grade once, DHCP Relay need accomplish a dhcp process with DHCP Server; Thereby increase the problem of the network traffics between DHCP Relay and the DHCP Server; The embodiment of the invention provides the distribution method and the device of a kind of IP address, and in embodiments of the present invention, DHCP Relay can pass through a message interaction; Apply for a plurality of IP address to DHCP Server, realize the batch application of IP address and network parameter.When user rs host was reached the standard grade, DHCP Relay can distribute the IP address that from DHCP Server, obtains for user rs host, has reduced the network traffics between DHCP Relay and the DHCP Server.
According to the embodiment of the invention, a kind of IP is provided the distribution method of address, can but be not limited among the DHCP Relay in DHCP relay network as shown in Figure 2 to realize the batch application of DHCP user rs host IP address and network parameter.
Fig. 3 is the flow chart according to the distribution method of the IP address of the embodiment of the invention, and is as shown in Figure 3, and this method can comprise following step (step S302-step S306):
Step S302, DHCP relay judge whether and need obtain procotol IP address from Dynamic Host Configuration Protocol server after receiving first DHCP (DHCP) discovery message.
Step S304 is under the situation that is in judged result, and DHCP relay obtains and store a plurality of IP address from Dynamic Host Configuration Protocol server.
Step S306 selects an IP address assignment to give the user rs host that sends first dhcp discover message from a plurality of IP address that obtains.
Pass through the embodiment of the invention; After receiving dhcp discover message; At first judging whether and need obtain IP address and corresponding network parameter from Dynamic Host Configuration Protocol server, is under the situation that is in judged result, obtains a plurality of IP address from Dynamic Host Configuration Protocol server; From a plurality of IP that obtain, choose an IP address and corresponding network parameter, distribute to the user rs host of request distributing IP address and corresponding network parameter.Simultaneously; Can preserve a plurality of IP address that Dynamic Host Configuration Protocol server distributes; Thereby when other user rs host request distributing IP addresses and corresponding network parameter, can from remaining IP address, be user rs host distributing IP address and corresponding network parameter directly, and need not to carry out message interaction with DHCP Server; Thereby reduce the network traffics between DHCP Relay and the DHCP Server, reduce requirement simultaneously DHCP Server disposal ability.
Describe in the face of above-mentioned each step down.
At present, in the DHCP relay network, when user rs host is reached the standard grade, can obtain IP address and corresponding network parameter through dhcp process.User rs host sends dhcp discover message (DHCP Discover message) to DHCP Relay; After DHCP Relay receives dhcp discover message; Dhcp discover message to receiving encapsulates again; And the dhcp discover message after DHCP Server sends encapsulation again, request DHCP Server distributing IP address and corresponding network parameter; DHCP Server is user rs host distributing IP address and corresponding network parameter after receiving the dhcp discover message of encapsulation again, and sends the dhcp response message (DHCP OFFER) of carrying IP address allocated and corresponding network parameter to DHCP Relay; After DHCP Relay receives dhcp response message, DHCP Server IP address allocated and corresponding network parameter are sent to user rs host, thereby user rs host is through IP address allocated and corresponding network parameter access network.
Yet; When existing a large amount of user rs hosts to reach the standard grade; DHCP Relay is respectively each user rs host of reaching the standard grade from DHCP Server and obtains IP address and corresponding network parameter; Thereby will produce a large amount of message interactions between DHCP Relay and the DHCP Server, thereby take the network bandwidth, and the disposal ability of DHCP Server will be brought challenges.In order to reduce the message interaction between DHCP Relay and the DHCP Server; To reduce the network traffics between DHCP Relay and the DHCP Server; In embodiments of the present invention, DHCP Relay can once apply for a plurality of IP address and corresponding network parameter to DHCP Server.When user rs host is reached the standard grade, the user rs host of distributing to request IP address and corresponding network parameter that DHCP Relay will be from a plurality of IP address of DHCP Server application.In said process, DHCP Relay need not to carry out message interaction with DHCP Server, thereby reduces the network traffics between DHCP Relay and the DHCP Server, reduces the requirement to DHCP Server disposal ability.In addition, between DHCP Relay and DHCP Server, can adopt relevant authentication mechanism, improve security performance.
When user rs host is reached the standard grade; Send dhcp discover message (i.e. first dhcp discover message) to DHCP Relay; After DHCP Relay receives the dhcp discover message of user rs host transmission; Can judge whether and to obtain IP address and corresponding network parameter from Dynamic Host Configuration Protocol server, when DHCP Server obtains IP address and corresponding network parameter, obtain a plurality of IP address and corresponding network parameter from DHCP Server at needs; Need when obtain IP address and corresponding network parameter, DHCP from DHCP Relay, not choose an IP address assignment in the stored IP address and give user rs host.
In practical application, as required, can apply for IP address and corresponding network parameters conditions in batches from DHCP Server by configuration DHCP Relay, DHCP Relay obtains the IP address according to the pre-conditioned needs that judge whether from DHCP Server.For example; Be arranged on the predetermined threshold value of the remaining IP number of addresses of DHCP Relay; After DHCP Relay receives the dhcp discover message of user rs host; Whether the quantity of judging remaining IP address among the DHCP Relay less than predetermined threshold value, and when the quantity of remaining IP address among the DHCP Relay during less than predetermined threshold value, DHCP Relay obtains a plurality of IP address and corresponding network parameter from DHCP Server; When the quantity of remaining IP address among the DHCP Relay during, can directly from DHCP Relay user rs host distributing IP address and corresponding network parameter greater than predetermined threshold value.
Perhaps, also can after receiving dhcp discover message, judge whether store the IP address among the DHCP Relay.If store the IP address among the DHCP Relay, can directly from DHCP Relay, choose an IP address and corresponding network parameter in the stored IP address, distribute to the user rs host of request network parameter; If do not store the IP address and the corresponding network parameter that can supply user rs host to use among the DHCP Relay; DHCP Relay can obtain a plurality of IP address and corresponding network parameter from DHCP Server; After getting access to a plurality of IP address; DHCP Relay chooses an IP address and corresponding network parameter from a plurality of IP address that obtains, distribute to the user rs host that sends dhcp discover message, and DHCP Relay can store a plurality of IP address and the network parameter that obtains; When other user rs hosts are reached the standard grade, distribute to other user rs hosts.
Further; Can also be arranged on DHCP Relay after receiving dhcp discover message; Judge whether receive dhcp discover message is to receive dhcp discover message in the current period for the first time; After promptly receiving dhcp discover message; Judge that DHCP Relay is receiving dhcp discover message for the first time after the releasing IP addresses each time in batches, when DHCPRelay receives dhcp discover message the first time, DHCP Relay obtains a plurality of IP address and corresponding network parameter from DHCP Server; When DHCP Relay receives dhcp discover message for the first time; Can confirm that DHCP Relay has got access to a plurality of IP address from DHCP Server; DHCP Relay can choose an IP address and corresponding network parameter from a plurality of IP address of this locality storage, distribute to the user rs host that sends dhcp discover message.
If DHCP Relay need obtain a plurality of IP address from DHCP Server; DHCP Relay can encapsulate the dhcp discover message that receives again; And the dhcp discover message (second dhcp discover message) after DHCP Server sends encapsulation again; Request DHCP Server distributes a plurality of IP address and corresponding network parameter for DHCP Relay; DHCPServer is DHCP Relay distributing IP address according to actual conditions, and can the IP and the corresponding network parameter of distributing be carried in the dhcp response message, is sent to DHCP Relay; DHCP Relay receives the dhcp response message that DHCP Server sends, and can from dhcp response message, be retrieved as a plurality of IP address and the corresponding network parameter of its distribution.
Simultaneously; DHCP Relay can be sent to DHCP Server with IP address that receives and corresponding network parameter; For example, IP address and corresponding network parameter are carried in the DHCP request message (DHCP Request message), DHCP Server verifies IP address allocated information; The IP address information that checking DHCP Relay receives be its IP address allocated information consistent after; Send DHCP acknowledge message (DHCP ACK message) to DHCP Relay, the DHCP that DHCP Relay receives DHCP Server transmission confirms message, and is stored as its IP address allocated and corresponding network parameter.
In practical application, the quantity of distributing IP address can be confirmed by DHCP Relay, also can be confirmed by DHCP Server.When DHCP Relay confirms the quantity of distributing IP address, can carry the quantity of application distributing IP address in the dhcp discover message that DHCP Relay sends; When DHCP Server confirms the quantity of distributing IP address; DHCP Server can confirm as the quantity of its IP address allocated according to the situation of DHCP Relay; For example, the user rs host quantity that has according to DHCP Relay, and/or the IP application IP addresses historical record of DHCP Relay; And the surplus etc. of unappropriated IP address among the DHCP Server, confirm as the quantity of DHCP Relay distributing IP address.
In a preferred implementation of the embodiment of the invention; DHCP Relay is its IP address allocated and corresponding network parameter in order to manage; The user rs host information table be can set up, user rs host and the corresponding relation that is this user rs host IP address allocated and corresponding network parameter are used for writing down.User rs host can send leave message to DHCP Relay when off-line, DHCP Relay is released to the user rs host IP address allocated after receiving the leave message of user rs host transmission, the information of respective client main frame in the deletion user rs host information table.When other user rs hosts are reached the standard grade, can the main frame of request IP address and corresponding network parameter be distributed at this in the IP address.
In order to improve the utilance of IP address; Can be set the rental period for IP address allocated; Preferably, DHCP Server can distribute long rental period for the IP address field, and DHCP Relay is that user rs host distributes a shorter rental period; Can realize user's keep-alive like this, also avoid the frequent message interaction between DHCP Relay and the DHCP Server.When the rental period of IP address reaches; User rs host can be re-rented IP address and corresponding network parameter to DHCP Relay; When the long rental period that DHCP Server distributes for the IP address field arrived, DHCP Relay also can continue to re-rent IP address and network parameter to DHCP Server.In embodiments of the present invention; In order to reduce the Signalling exchange between DHCP relay and the Dynamic Host Configuration Protocol server, a plurality of IP address that DHCP can disposable release Dynamic Host Configuration Protocol server distributes for this DHCP relay, for example; When DHCP relay confirms that a plurality of IP address that Dynamic Host Configuration Protocol server distributes (for example; When reaching the preset rental period (being the above-mentioned long rental period) a service time IP address field), judging the information that whether also has user rs host in the user rs host information table, is under the situation not in judged result; Send the DHCP release message to Dynamic Host Configuration Protocol server; Discharging all IP addresses of local storage, is under the situation that is in judged result, re-rents a plurality of IP address into its distribution to Dynamic Host Configuration Protocol server.
In a preferred embodiment of the invention, DHCP Relay can utilize the Option field in the DHCP message, the batch application of IP address and corresponding network parameter between completion DHCP Relay and the DHCP Server.
In the preferred embodiment of the present invention, can utilize 2 self-defined Option fields of DHCP agreement, can be called Option-A and Option-B respectively.Can distribute planning at DHCP Relay householder's machine number of acting as a guest.For example; Plan that this DHCP Relay hangs 100 user rs hosts down; When receiving DHCP Discover message that first DHCP user rs host is sent, this DHCP Relay carries out message when encapsulating again so; Insert Option-A, contain user rs host among the Option-A and count planning information: apply for 100 IP addresses and corresponding network parameter.
As shown in Figure 4; After DHCP Relay receives DHCP Discover message; Can judge whether the user rs host that sends DHCP Discover message is first user rs host, if first user rs host, DHCP Relay is when encapsulating this message again; Insert the Option-A Option Field, this field is carried total user and is planned number.If this user rs host is not first user rs host; Whether the IP address field of judging DHCP Relay application again has residue, if having, then DHCP Relay carries out the function of DHCP Server; Directly to DHCP user rs host distributing IP address and network parameter; If do not have remaining ip address among the DHCP Relay, then can refuse this user rs host and insert, and provide the alarm printing.
As shown in Figure 5; Receive the DHCP Discover message that carries Option-A as DHCP Server; Judge whether Dynamic Host Configuration Protocol server discerns Option-A; If this DHCP Server can discern Option-A, can resolve the parameter information (information such as the quantity of application IP address and corresponding network address, DHCP Relay user rs host planning number) that carries among the Option-A.If DHCP Server can satisfy the requirement of describing among the Option-A, then can 100 IP addresses of primary distribution, and can the network of relation parameter be encapsulated among the Option-B together, insert DHCP Offer message, send to DHCP Relay.If remaining shortage of ip address is 100 among the DHCP Server, just need special processing.For example, be not this DHCP Relay distributing IP address, think that this is an abnormal state, and provide alarm; Perhaps, for DHCP request each time, distribute an IP address, and provide alarm; Perhaps confirm as the quantity of DHCP Relay IP address allocated according to the quantity of remaining IP address among the DHCP Server.If this DHCP Server does not support the Option-A option, can directly ignore the Option-A option so, carry out common flow processing, can in response message, not insert the Option-B option yet.
As shown in Figure 6; When DHCP Relay receives DHCP Offer message; Judge that whether DHCP Offer message carries the Option-B option, if message carries correct Option-B option, then sets up casual user's list item; Send the DHCP Request message carry the Option-A option to DHCP Server, with the information reproduction in the Option-B option to the Option-A option and be encapsulated in the DHCP Request message.If the DHCP Offer message that DHCP Relay receives does not carry the Option-B option, then carry out common DHCP message interaction flow process.
As shown in Figure 7; Receive the DHCP Request message that carries Option-A as DHCP Server; Whether the interim list item of foundation is consistent on the IP address that receives of contrast and corresponding network parameter and the DHCP Server; If consistent, then set up local user's information, and send the DHCP ACK message that carries Option-B and confirm.If inconsistent then refusing user's inserts; In DHCP Request message, do not contain the Option-A option, explanation is common DHCP flow process, then carries out common DHCP message interaction.
As shown in Figure 8, when DHCP Relay receives DHCP ACK message, judge whether to carry the Option-B option, if carry, then DHCP Relay sets up user message table, and sends DHCP ACK message to first user rs host., DHCP Offer message carries out the reciprocal process of common message if not carrying the Option-B option.When the user rs host in the network is initiated dhcp process once more and is obtained IP address and corresponding network parameter; DHCP Relay can directly push IP address and relevant parameter; Serve as the effect of DHCP Server, and need not between DHCP Relay and DHCP Server, to carry out message interaction.
When the user rs host that obtains IP and network parameter was re-rented, message only needed between user and DHCP Relay, accomplish to get final product alternately.Expire when the address field rental period of DHCP Relay, can between DHCP Relay and DHCP Server, accomplish one and re-rent flow process, similar with above-mentioned message interaction, do not do at this and to give unnecessary details.
As shown in Figure 9, when DHCP Relay receives leave message, can judge whether to be last user.As this user during for last user who leaves, DHCP Relay can carry out following dual mode to be handled: 1) remove local user's information; 2) send DHCP Release message to DHCP Server, all IP addresses are discharged.When this user is not last user, then DHCP Relay need not to carry out message interaction with DHCP Server, only needs to remove user profile in this locality and get final product.
In practical application, can also bind in advance the MAC and the IP address of user rs host at DHCP Relay, only be the MAC Address distributing IP address of binding, to improve fail safe.
Pass through the preferred embodiment of the present invention; The DHCP message interaction is optimized, has overcome in the catenet topology, DHCP message interaction data traffic is bigger; Bring the problem of bigger burden for DHCP Server; And complete compatible existing protocol standard reduces DHCP message interaction quantity significantly, and is to a certain degree improving security performance.
According to the embodiment of the invention, a kind of IP also is provided the distributor of address, DHCP Relay be can be arranged in and user rs host distributing IP address and corresponding network parameter are embodied as at the DHCP network.
Figure 10 is the structured flowchart according to the distributor of the IP address of the embodiment of the invention, and is shown in figure 10, and this device can comprise: first judge module 10, acquisition module 20 and distribution module 30.Wherein, first judge module 10, be used to receive first dhcp discover message (being the dhcp discover message that user rs host sends) after, judge whether and need obtain the IP address from Dynamic Host Configuration Protocol server (DHCP Server); Acquisition module 20 is coupled with first judge module 10, and being used in judged result is under the situation that is, obtains and store a plurality of IP address from Dynamic Host Configuration Protocol server; Distribution module 30 is coupled with acquisition module 20, is used for selecting an IP address assignment to give the user rs host that sends first dhcp discover message from a plurality of IP address that obtains.
For fear of the network traffics that increase between DHCP Relay and the DHCP Server, DHCP Relay can once apply for a plurality of IP address and corresponding network parameter to DHCP Server.When the user rs host in the network was reached the standard grade, DHCP Relay can distribute to from a plurality of IP address of DHCP Server application the user rs host of request IP address and corresponding network parameter.In this process; DHCP Relay need not to carry out message interaction with DHCP Server; Thereby can reduce the network traffics between DHCP Relay and the DHCP Server effectively, DHCP need not to handle too much DHCP message simultaneously, thereby reduces the requirement to DHCP Server disposal ability.
When user rs host is reached the standard grade; Can send dhcp discover message to DHCP Relay; After DHCP Relay receives the dhcp discover message of user rs host transmission; First judge module 10 can judge whether to obtain IP address and corresponding network parameter from Dynamic Host Configuration Protocol server, and when DHCP obtained IP address and corresponding network parameter, acquisition module 20 can obtain a plurality of IP address and corresponding network parameter from DHCPServer at needs; If DHCP Relay need not obtain IP address and corresponding network parameter from DHCP Server, distribution module 30 can be chosen an IP address from the local stored IP address of DHCP Relay, distribute to the user rs host of request IP address and corresponding network parameter.
In practical application, as required, can apply for IP address and corresponding network parameters conditions in batches from DHCP Server by configuration DHCP Relay, DHCP Relay obtains the IP address according to pre-conditioned judging whether from DHCP Server.For example; Be arranged on the predetermined threshold value of the remaining IP number of addresses of DHCP Relay; After receiving the dhcp discover message of user rs host; Whether first judge module 10 can judge the quantity of remaining IP address among the DHCP Relay less than predetermined threshold value, and when the quantity of remaining IP address among the DHCP Relay during less than predetermined threshold value, acquisition module 20 can obtain a plurality of IP address and corresponding network parameter from DHCP Server; When the quantity of remaining IP address among the DHCP Relay during greater than predetermined threshold value, distribution module 30 can be that user rs host distributes an IP address and corresponding network parameter in the remaining IP address from DHCP Relay.
Perhaps, first judge module 10 also can judge whether store the IP address among the DHCP Relay after receiving dhcp discover message.If store the IP address that can supply user rs host to use among the DHCP Relay, distribution module 30 can be chosen an IP address and corresponding network parameter in the stored IP address from DHCP Relay, distributes to the user rs host of request network parameter; If storing IP address not among the DHCP Relay; Acquisition module 20 can obtain a plurality of IP address and corresponding network parameter from DHCP Server, get access to a plurality of IP address after, distribution module 30 is chosen an IP address and corresponding network parameter from the IP address that obtains; Distribute to the user rs host that sends dhcp discover message; And DHCP Relay can store a plurality of IP address and the network parameter that obtains, and when other user rs hosts are reached the standard grade, distributes to other user rs hosts.
Further; Can also be arranged on DHCP Relay after receiving dhcp discover message; First judge module 10 judges whether receive dhcp discover message is to receive dhcp discover message for the first time; Promptly receive and judge that DHCP Relay receives dhcp discover message for the first time behind the dhcp discover message, when DHCP Relay receives dhcp discover message for the first time, acquisition module 20 can obtain a plurality of IP address and corresponding network parameter from DHCP Server; When DHCP Relay receives dhcp discover message for the first time; Can confirm that DHCP Relay has got access to a plurality of IP address from DHCP Server; Distribution module 30 can be chosen an IP address and corresponding network parameter from a plurality of IP address that has obtained, distribute to corresponding user rs host.
Can obtain from DHCP Server under the situation of a plurality of IP address at acquisition module 20; DHCP Relay can encapsulate the dhcp discover message that receives again; And the dhcp discover message (being called second dhcp discover message) after DHCP Server sends encapsulation again; Request DHCP Server distributes a plurality of IP address and corresponding network parameter for it; DHCP Server is DHCP Relay distributing IP address, the IP that distributes and corresponding network parameter is carried at is sent to DHCP Relay in the dhcp response message; DHCP Relay receives the dhcp response message that DHCP Server sends, and therefrom is retrieved as its IP address allocated and corresponding network parameter.Therefore, in a preferred implementation of the embodiment of the invention, to achieve these goals, acquisition module 20 can comprise: transmitting element is used for sending second dhcp discover message (dhcp discover message after promptly encapsulating again) to Dynamic Host Configuration Protocol server; Acquiring unit is used for obtaining acquisition request a plurality of IP address and corresponding network parameter from the dhcp response message that Dynamic Host Configuration Protocol server sends.
Simultaneously, DHCP Relay can be sent to Dynamic Host Configuration Protocol server with the IP address that receives, and DHCP verifies IP address allocated information; After checking is passed through; For example, the IP address information that receives is sent the DHCP acknowledge message with after IP address allocated information is consistent to DHCP Relay; The DHCP that DHCP Relay receives the Dynamic Host Configuration Protocol server transmission confirms message, and is stored as its IP address allocated and corresponding network parameter.Therefore, in a preferred implementation of the embodiment of the invention, shown in figure 11, said apparatus can also comprise: sending module 40 is used for carrying the DHCP request message of a plurality of IP address to the Dynamic Host Configuration Protocol server transmission; Receiver module 50 is used under the consistent situation in the IP address that a plurality of IP address and Dynamic Host Configuration Protocol server send, receiving the DHCP acknowledge message of Dynamic Host Configuration Protocol server transmission.Through this preferred implementation, can improve the reliability of IP address assignment, guarantee the accuracy of IP address assignment.
In a preferred implementation of the embodiment of the invention, DHCP Relay can set up the user rs host information table in order to manage to its IP address allocated and corresponding network parameter; Therefore; Said apparatus can also comprise: set up module, be used to receive the DHCP acknowledge message after, set up the user rs host information table; Wherein, the user rs host information table can write down user rs host and be the corresponding relation of user rs host IP address allocated.Through this preferred implementation, DHCP Relay can manage the IP address easily.
User rs host can send leave message to DHCP Relay when off-line, DHCP Relay is released to the user rs host IP address allocated after receiving the leave message of user rs host transmission, the information of respective client main frame in the deletion user rs host information table.When other user rs hosts are reached the standard grade, can the main frame of request IP address and corresponding network parameter be distributed at this in the IP address.Therefore, said apparatus can also comprise: release module is used for after the leave message that receives the user rs host transmission, being released to the user rs host IP address allocated information of corresponding client main frame in the deletion user rs host information table.
In order to improve the utilance of IP address; Can be set the rental period for IP address allocated; Preferably, DHCP Server can distribute long rental period for the IP address field, and DHCP Relay is that user rs host distributes a shorter rental period; Can realize user's keep-alive like this, also avoid the frequent message interaction between DHCP Relay and the DHCP Server.When the rental period of IP address reached, user rs host and DHCP Relay can re-rent IP address and corresponding network parameter.After DHCP relay confirms that the IP address in the DHCP relay reaches the preset rental period service time; Judge the information that whether also has user rs host in the user rs host information table; In judged result is under the situation not, sends the DHCP release message to Dynamic Host Configuration Protocol server, discharges local all IP addresses of storing; In judged result is under the situation that is, re-rents a plurality of IP address into its distribution to Dynamic Host Configuration Protocol server.
To achieve these goals, said apparatus can also comprise: determination module is used for judging that the IP address of DHCP relay reaches the preset rental period service time; Second judge module is used for judging whether the user rs host information table also has the information of user rs host; In judged result is under the situation not, and sending module also is used for sending the DHCP release message to Dynamic Host Configuration Protocol server, discharges local all IP addresses of storing; In judged result is under the situation that is, re-rents module and is used for re-renting IP address allocated by a definite date to Dynamic Host Configuration Protocol server.
From above description, can find out that the embodiment of the invention has realized following technique effect: DHCP Relay can pass through a message interaction, applies for a plurality of IP address to DHCP Server, realizes the batch application of IP address and network parameter.When user rs host was reached the standard grade, DHCP Relay can distribute the IP address that from DHCP Server, obtains for user rs host, has reduced the network traffics between DHCP Relay and the DHCP Server.Simultaneously, can adopt relevant authentication mechanism between DHCP Relay and the DHCP Server, improve fail safe; Can also bind in advance the MAC and the IP address of user rs host at DHCP Relay, only fail safe is improved in the MAC Address distributing IP address for binding.
Obviously, it is apparent to those skilled in the art that above-mentioned each module of the present invention or each step can realize with the general calculation device; They can concentrate on the single calculation element; Perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element; Thereby; Can they be stored in the storage device and carry out, and in some cases, can carry out step shown or that describe with the order that is different from here by calculation element; Perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the distribution method of an IP address is characterized in that, comprising:
DHCP relay judges whether and need obtain procotol IP address from Dynamic Host Configuration Protocol server after receiving first dynamic host configuration protocol DHCP discovery message;
In judged result is under the situation that is, said DHCP relay obtains and store a plurality of IP address from said Dynamic Host Configuration Protocol server;
From the said a plurality of IP address that obtains, select an IP address assignment to give the user rs host that sends said first dhcp discover message.
2. method according to claim 1 is characterized in that, is that said method also comprises under the situation not in said judged result: from local stored IP address, select an IP address assignment to give said user rs host.
3. method according to claim 1 is characterized in that, judges whether that obtaining procotol IP address from Dynamic Host Configuration Protocol server comprises:
Judge whether said DHCP relay stores the unallocated IP address of giving user rs host.
4. method according to claim 1 is characterized in that, is under the situation that is in judged result, obtains a plurality of IP address from Dynamic Host Configuration Protocol server and comprises:
Send second dhcp discover message to said Dynamic Host Configuration Protocol server;
From the dhcp response message that said Dynamic Host Configuration Protocol server sends, obtain the said a plurality of IP of acquisition request address.
5. method according to claim 4 is characterized in that, from the dhcp response message that said Dynamic Host Configuration Protocol server sends, obtains after the said a plurality of IP of the acquisition request address, and said method also comprises:
Carry the DHCP request message of said a plurality of IP address to said Dynamic Host Configuration Protocol server transmission;
Under the consistent situation in the IP address of sending with said Dynamic Host Configuration Protocol server, receive the DHCP acknowledge message of said Dynamic Host Configuration Protocol server transmission in said a plurality of IP address.
6. method according to claim 5 is characterized in that, receives after the DHCP acknowledge message of said Dynamic Host Configuration Protocol server transmission, and said method also comprises:
Set up the user rs host information table, wherein, said user rs host information table is used to write down user rs host and is the corresponding relation of user rs host IP address allocated;
After receiving the leave message of user rs host transmission, be released to said user rs host IP address allocated, delete the information of user rs host described in the said user rs host information table;
Confirm that said Dynamic Host Configuration Protocol server is after service time of said a plurality of IP address of distributing of said DHCP relay reaching for the first preset rental period; Judge the information that whether also has user rs host in the said user rs host information table; In judged result is under the situation not, sends the DHCP release message to said Dynamic Host Configuration Protocol server, discharges said a plurality of IP address; In judged result is under the situation that is, re-rents said a plurality of IP address to said Dynamic Host Configuration Protocol server.
7. method according to claim 6 is characterized in that, after from the said a plurality of IP address that obtains, selecting the user rs host of an IP address assignment to said first dhcp discover message of transmission, said method also comprises:
When the second preset rental period arrived; Judge whether to receive leave message from said user rs host; If no, then send notice to said user rs host, notify said user rs host to re-rent the said IP address of from the said a plurality of IP address that obtains, selecting; Wherein, the said first preset rental period is greater than the said second preset rental period.
8. the distributor of an IP address is characterized in that, comprising:
First judge module after being used to receive first dynamic host configuration protocol DHCP and finding message, judges whether and need obtain procotol IP address from Dynamic Host Configuration Protocol server;
Acquisition module, being used in judged result is under the situation that is, obtains and store a plurality of IP address from said Dynamic Host Configuration Protocol server;
Distribution module is used for selecting an IP address assignment to give the user rs host that sends said first dhcp discover message from the said a plurality of IP address that obtains.
9. device according to claim 8 is characterized in that, said distribution module also is used for: in said judged result is under the situation not, from local stored IP address, selects an IP address assignment to give said user rs host.
10. device according to claim 8 is characterized in that, said acquisition module comprises:
Transmitting element is used for sending second dhcp discover message to said Dynamic Host Configuration Protocol server;
Acquiring unit is used for obtaining the said a plurality of IP of acquisition request address from the dhcp response message that said Dynamic Host Configuration Protocol server sends.
11. device according to claim 10 is characterized in that, said device also comprises:
Sending module is used for carrying the DHCP request message of said a plurality of IP address to said Dynamic Host Configuration Protocol server transmission;
Receiver module under the consistent situation in the IP address that is used for sending with said Dynamic Host Configuration Protocol server in said a plurality of IP address, receives the DHCP acknowledge message of said Dynamic Host Configuration Protocol server transmission.
12. device according to claim 11 is characterized in that, said device also comprises:
Set up module, be used to receive said DHCP acknowledge message after, set up the user rs host information table, wherein, said user rs host information table can write down user rs host and be the corresponding relation of user rs host IP address allocated;
Release module is used for after the leave message that receives the user rs host transmission, being released to said user rs host IP address allocated, deletes the information of user rs host described in the said user rs host information table;
Determination module is used for judging that the IP address of DHCP relay reaches the preset rental period service time;
Second judge module is used for judging whether said user rs host information table also has the information of user rs host;
Said sending module, the judged result that also is used at said second judge module is under the situation not, sends the DHCP release message to said Dynamic Host Configuration Protocol server, discharges local all IP addresses of storing;
Re-rent module, the judged result that is used at said second judge module is under the situation that is, re-rents said a plurality of IP address to said Dynamic Host Configuration Protocol server.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103932466A CN102413203A (en) | 2011-12-01 | 2011-12-01 | IP (Internet Protocol) address allocation method and device |
| PCT/CN2012/074195 WO2013078814A1 (en) | 2011-12-01 | 2012-04-17 | Ip address allocation method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103932466A CN102413203A (en) | 2011-12-01 | 2011-12-01 | IP (Internet Protocol) address allocation method and device |
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| CN102413203A true CN102413203A (en) | 2012-04-11 |
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| CN2011103932466A Pending CN102413203A (en) | 2011-12-01 | 2011-12-01 | IP (Internet Protocol) address allocation method and device |
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| WO (1) | WO2013078814A1 (en) |
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Application publication date: 20120411 |