CN1949784A - IP address requesting method for DHCP client by DHCP repeater - Google Patents
IP address requesting method for DHCP client by DHCP repeater Download PDFInfo
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Abstract
The invention discloses a method for DHCP (dynamic host configuration protocol) relay to request IP address for DHCP client end, comprising: A. DHCP relay receives configuration request message sent by DHCP client end by broadcast, and adds above one gateway IP address or network segment address to the configuration request message and then sends the message to DHCP server; B. DHCP server determines gateway IP address or network segment address of the subnetwork the DHCP client end belongs to, by the added gateway IP address or network segment address in the request message, and allocates an IP address in a corresponding address pool to the determined gateway IP address or network segment address to the DHCP client end and transmits the allocated IP address through the DHCP relay to the DHCP client end. And the method only requires the DHCP relay and DHCP server make one communication interaction in the course that the DHCP client end obtains dynamic allocated IP address by DHCP relay, saving time and raising efficiency.
Description
Technical field
The present invention relates to DHCP (DHCP) server is the technology of dhcp client distributing IP address, and particularly a kind of DHCP relay is the method for dhcp client to Dynamic Host Configuration Protocol server request IP address.
Background technology
Along with the expansion of network size and the raising of network complexity, the configuration of network becomes increasingly complex, through regular meeting occur that client location changes and client terminal quantity above the problem that can distribute Internet protocol (IP) address.In order to address the above problem, the DHCP technology has appearred, adopt the server (hereinafter to be referred as Dynamic Host Configuration Protocol server) of DHCP technology can carry out IP address dynamic assignment, make the dhcp client of current access network accept the service of network by institute's IP address allocated the dhcp client of current access network.
Early stage DHCP agreement only is applicable to that dhcp client and Dynamic Host Configuration Protocol server are in the situation of same sub-network, can not cross over sub-network.That is to say that Dynamic Host Configuration Protocol server can only have the IP address in the network segment address for this sub-network of dhcp client dynamic assignment that belongs to same sub-network.Therefore, in order to carry out the dynamic assignment of IP address to the dhcp client that belongs to the different sub-network network in the network, just need distinguish the configuration DHCP server in the all-ones subnet network of network, this can increase the construction cost of network.
The introducing of DHCP relay has solved this problem: the dhcp client in the different sub-network network of network can communicate by the DHCP relay of administration sub-network and the Dynamic Host Configuration Protocol server of network, thereby obtains the IP address that Dynamic Host Configuration Protocol server is given the dhcp client dynamic assignment in the different sub-network network of network.Similarly, giving the IP address of the dhcp client dynamic assignment in the sub-network still is that this sub-network has the IP address in the network segment address.Dhcp client in a plurality of different sub-network networks of network can get access to dynamic institute IP address allocated from same Dynamic Host Configuration Protocol server by DHCP relay, like this, both provides cost savings, and is convenient to the centralized management to Dynamic Host Configuration Protocol server again.
In general, DHCP relay can be a computer, also can be router, as long as load the service routine and the startup of dhcp relay agent in DHCP relay.DHCP relay can dispose a plurality of gateway ip address, and one of them is primary gateway IP address, other be from gateway ip address, these gateway ip address are IP addresses of gateway in the different sub-network network, are used to identify the different segment address that the different sub-network network has.Like this, a DHCP relay just can be managed a plurality of sub-networks, and DHCP relay interface network segment address few, that managed disperses and the needs of dynamically allocate address thereby can satisfy.
In order to give dhcp client dynamic assignment IP address, in Dynamic Host Configuration Protocol server, be provided with the corresponding relation of gateway ip address and address pool or/and be provided with network segment address and the corresponding relation of address pool, wherein, stored in the address pool at gateway ip address or/and a plurality of IP address that can dynamic assignment under the network segment address.This that is to say that the address pool of storing a plurality of IP address can be with gateway ip address or/and the network segment address sign.
Fig. 1 is the application schematic diagram of DHCP relay in network in the prior art, and as shown in the figure: DHCP relay communicates by internet (Internet) and Dynamic Host Configuration Protocol server, and four dhcp clients insert DHCP relay.
Fig. 2 is the method flow diagram of dhcp client to Dynamic Host Configuration Protocol server request IP address for the prior art DHCP relay, and its concrete steps are:
The process that dhcp client inserts sub-network is: the dhcp client that is connected sub-network starts, and perhaps restarts behind the current connexon network of dhcp client.
The DHCP relay of sub-network arrives the configuring request message by broadcast reception under step 201, the management dhcp client, the primary gateway IP address that will dispose on DHCP relay sends to Dynamic Host Configuration Protocol server with this configuring request message after being filled into gateway field in the configuring request message.
After step 202, Dynamic Host Configuration Protocol server receive this configuring request message, the information and the primary gateway IP address of the dhcp client that carries according to this configuring request message, determine whether from corresponding address pond, primary gateway IP address, to give dhcp client distributing IP address, if then change step 203 over to; Otherwise, then change step 204 over to.
Because the information of in the configuring request message, having carried dhcp client, this information can comprise routing iinformation and medium access control (MAC) address etc., so Dynamic Host Configuration Protocol server just can judge whether dhcp client belongs to the sub-network with primary gateway IP address according to entrained information, thereby can determine whether from corresponding address pond, primary gateway IP address, to give dhcp client distributing IP address.
One of will dispose of step 205, DHCP relay sends to Dynamic Host Configuration Protocol server with this configuring request message after gateway ip address is filled into gateway field the configuring request message.
After step 206, Dynamic Host Configuration Protocol server receive this configuring request message, the information of the dhcp client that carries according to this configuring request message and from gateway ip address, determine whether to arrive and from gateway ip address corresponding address pond, give dhcp client distributing IP address, if then change step 207 over to; Otherwise, then change step 208 over to.
From such scheme as can be seen, dhcp client is in order to obtain the IP address of dynamic assignment from Dynamic Host Configuration Protocol server by DHCP relay, need DHCP relay and Dynamic Host Configuration Protocol server to carry out repeatedly communication interaction, caused dhcp client by the overlong time of DHCP relay from the IP address of Dynamic Host Configuration Protocol server acquisition dynamic assignment, inefficiency.
Summary of the invention
In view of this, it is the method for dhcp client to Dynamic Host Configuration Protocol server request IP address that main purpose of the present invention is to provide a kind of DHCP relay, this method is in the process of dhcp client by the IP address of DHCP relay acquisition dynamic assignment, only need DHCP relay and Dynamic Host Configuration Protocol server to carry out communication interaction one time, can save time, raise the efficiency.
According to above-mentioned purpose, technical scheme of the present invention is achieved in that
A kind of dynamic host configuration protocol DHCP relaying is the method for dhcp client request IP address, gateway Internet protocol IP address is set or/and the corresponding relation of the address pool of network segment address and an above IP of storage address in Dynamic Host Configuration Protocol server, at DHCP relay more than one gateway ip address or more than one network segment address are set, this method also comprises:
The configuring request message that A, DHCP relay send to dhcp client by broadcast reception, in this configuring request message, fill set more than one gateway ip address or more than one network segment address after, send to Dynamic Host Configuration Protocol server;
Determine the gateway ip address or the network segment address of sub-network under this dhcp client in gateway ip address that B, Dynamic Host Configuration Protocol server are filled or the network segment address from this configuring request message, to dhcp client distribute the IP address in definite gateway ip address or the network segment address corresponding address pond, institute's IP address allocated is sent to dhcp client by DHCP relay.
Describedly at DHCP relay more than one gateway ip address is set and comprises a primary gateway IP address and more than one from gateway ip address.
Described configuring request message also carries the information of dhcp client, and step B is described to determine that the gateway ip address of the affiliated sub-network of this dhcp client or the process of network segment address are:
Determine the gateway ip address or the network segment address of sub-network under this dhcp client in gateway ip address that the information of the dhcp client that Dynamic Host Configuration Protocol server carries according to this configuring request message is filled according to the rule of setting or the network segment address from this configuring request message.
The set more than one gateway ip address of the described filling of steps A or more than one network segment address are set all gateway ip address or all network segment addresses.
The described institute of step B IP address allocated is carried in the configuration messages and sends.
When in described configuring request message, filling more than one gateway ip address, step B is described institute's IP address allocated is sent to dhcp client by DHCP relay before, this method also comprises:
Dynamic Host Configuration Protocol server sends to dhcp client with the gateway ip address of determining by DHCP relay.
Described definite gateway ip address is carried in the configuration messages and sends.
When in described configuring request message, filling more than one network segment address, step B is described institute's IP address allocated is sent to dhcp client by DHCP relay before, this method also comprises:
Dynamic Host Configuration Protocol server obtains the gateway ip address in corresponding address pond, and the gateway ip address in corresponding address pond is sent to dhcp client by DHCP relay.
The gateway ip address in described corresponding address pond is carried in the configuration messages and sends.
The described set more than one gateway ip address of steps A is filled into the sub-option that is provided with in the relay agent information Relay Agent Information option of configuring request message;
Perhaps the described set more than one network segment address of steps A is filled into the subnet that is provided with in the configuring request message and selects Subnet Selection option.
From such scheme as can be seen, the present invention is in the process of dhcp client by the IP address of DHCP relay acquisition dynamic assignment, in the configuring request message that employing all is filled into dhcp client with a plurality of gateway ip address or a plurality of network segment address of DHCP relay configuration, send to Dynamic Host Configuration Protocol server, determine to distribute IP address in which gateway ip address or the network segment address corresponding address pond according to the information of the dhcp client that carries in the configuring request message that receives by Dynamic Host Configuration Protocol server again, institute's IP address allocated is carried in the configuration messages sends to dhcp client by DHCP relay to dhcp client.Therefore, the present invention is in the process of dhcp client by the IP address of DHCP relay acquisition dynamic assignment, and DHCP relay and Dynamic Host Configuration Protocol server only carry out communication interaction one time, have saved the time, have improved efficient.
Description of drawings
Fig. 1 uses schematic diagram for the typical case of DHCP relay in network in the prior art.
Fig. 2 is the method flow diagram of dhcp client to Dynamic Host Configuration Protocol server request IP address for the prior art DHCP relay.
Fig. 3 is the flow chart of dhcp client to the method embodiment one of Dynamic Host Configuration Protocol server request IP address for DHCP relay of the present invention.
Fig. 4 is the flow chart of dhcp client to the method embodiment two of Dynamic Host Configuration Protocol server request IP address for DHCP relay of the present invention.
Embodiment
In order to make the purpose, technical solutions and advantages of the present invention clearer, below lift specific embodiment and, the present invention is described in more detail with reference to accompanying drawing.
The present invention is in the process of dhcp client by the IP address of DHCP relay acquisition dynamic assignment, DHCP relay and Dynamic Host Configuration Protocol server only carry out communication interaction one time, employing is filled into the more than one gateway ip address of DHCP relay configuration in the configuring request message of dhcp client, sends to Dynamic Host Configuration Protocol server.After Dynamic Host Configuration Protocol server receives this configuring request message, the information of the dhcp client that carries according to the configuring request message, the gateway ip address of determining the affiliated sub-network of dhcp client is which gateway ip address that the configuring request message is filled, thereby gives dhcp client distributing IP address from determined gateway ip address corresponding address pond.
Similarly, in order to give dhcp client dynamic assignment IP address, in Dynamic Host Configuration Protocol server, be provided with the corresponding relation of gateway ip address and address pool or/and be provided with network segment address and the corresponding relation of address pool according to prior art, wherein, stored in the address pool at gateway ip address or/and a plurality of IP address that can dynamic assignment under the network segment address.This that is to say that the address pool of storing a plurality of IP address can be with gateway ip address or/and the network segment address sign.
Fig. 3 is the flow chart of dhcp client to the method embodiment one of Dynamic Host Configuration Protocol server request IP address for DHCP relay of the present invention, and its concrete steps are:
The DHCP relay of sub-network arrives the configuring request message by broadcast reception under step 301, the management dhcp client, after all gateway ip address that will dispose (comprising that primary gateway IP address and all are from gateway ip address) are filled into the gateway field the configuring request message, this configuring request message is sent to Dynamic Host Configuration Protocol server on DHCP relay.
After step 302, Dynamic Host Configuration Protocol server receive this configuring request message, the information of the dhcp client that carries according to this configuring request message and all gateway ip address, according to allocation rule determine the gateway ip address of sub-network under the dhcp client be the primary gateway IP gateway address of filling in the configuring request message or which from gateway ip address, from determined gateway ip address corresponding address pond, give dhcp client distributing IP address.
Allocation rule of the present invention is that prior art is existing, and for example MAC Address or asymmetric subscribers feeder (ADSL) account information in the information of the dhcp client that can carry according to the configuring request message waits to determine gateway ip address.
In step 301, the gateway ip address that is filled into the gateway field in the configuring request message also can be a plurality of gateway ip address of DHCP relay configuration, rather than all gateway ip address of configuration, as primary gateway IP address and a plurality of, as long as exist the gateway ip address of the affiliated sub-network of dhcp client can adopt this technology in the gateway ip address of filling from gateway ip address or a plurality of from gateway ip address.
At this moment, in step 301, the process that a plurality of gateway ip address that dispose on DHCP relay are filled into the gateway field in the configuring request message is: increase a sub-option in the relay agent information in the configuring request message of prior art (the Relay Agent Information) option, be filled in a plurality of gateway ip address that dispose on the DHCP relay in this sub-option, the form of this sub-option is as shown in table 1:
Sub-option sign (1 byte) | Length (1 byte) | Gateway ip address ((number of addresses * 4) individual byte) |
Need IANA to distribute | Number of addresses * 4 | The tabulation of a plurality of gateway address, the IPv4 address |
Table 1
The present invention can also be provided with the network segment address that its sub-network of administering has in DHCP relay, at DHCP relay is that dhcp client is during to Dynamic Host Configuration Protocol server request IP address, also the network segment address of all settings can be appended in the configuring request message, send to Dynamic Host Configuration Protocol server and handle.Detailed process as described in Figure 4, Fig. 4 is the flow chart of dhcp client to the method embodiment two of Dynamic Host Configuration Protocol server request IP address for DHCP relay of the present invention, its concrete steps are:
The DHCP relay of sub-network to the configuring request message, will send to Dynamic Host Configuration Protocol server with this configuring request message by broadcast reception under step 401, the management dhcp client after all network segment addresses that dispose on the DHCP relay are filled into the configuring request message.
After step 402, Dynamic Host Configuration Protocol server receive this configuring request message, information and all network segment addresses of the dhcp client that carries according to this configuring request message, determine that according to allocation rule the network segment address that sub-network has under the dhcp client is which network segment address of filling in the configuring request message, from determined network segment address corresponding address pond, give dhcp client distributing IP address, and obtain the gateway ip address of the address pool correspondence of determined network segment address.
Allocation rule of the present invention is that prior art is existing, and for example MAC Address or the ADSL account information in the information of the dhcp client that can carry according to the configuring request message waits to determine network segment address.
In step 401, the network segment address that is filled in the configuring request message also can be a plurality of network segment addresses of DHCP relay configuration, rather than all network segment addresses of configuration, as long as exist the network segment address of the affiliated sub-network of dhcp client can adopt technology of the present invention in the network segment address of filling.
At this moment, in step 401, the process that a plurality of network segment addresses that will dispose on DHCP relay are filled into the configuring request message is: the existing subnet that is modified in the configuring request message is selected (SubnetSelection) option, promptly adopt the mode that increases a plurality of sub-networks, table 2 is the form of the existing Subnet Selection option that defines in the DHCP standard:
Types value (1 byte) | Subnet address length (1 byte) | 4 bytes |
118 | 4 | The subnet address |
Table 2
The form of the Subnet Selection option that table 3 is repaiied for the present invention:
Types value (1 byte) | 1 byte | Random length (subnet quantity * 4) |
118 | Subnet quantity * 4 | The tabulation of a plurality of subnet address, each 4 byte |
Table 3
From Fig. 3 and the described scheme of Fig. 4 as can be seen, the present invention is in the process of dhcp client by the IP address of DHCP relay acquisition dynamic assignment, in the configuring request message that employing all is filled into dhcp client with a plurality of gateway ip address or a plurality of network segment address of DHCP relay configuration, send to Dynamic Host Configuration Protocol server, determine to distribute IP address in which gateway ip address or the network segment address corresponding address pond according to the information of the dhcp client that carries in the configuring request message that receives by Dynamic Host Configuration Protocol server, institute's IP address allocated is carried in the configuration messages sends to dhcp client by DHCP relay to dhcp client.Therefore, the present invention is in the process of dhcp client by the IP address of DHCP relay acquisition dynamic assignment, and DHCP relay and Dynamic Host Configuration Protocol server only carry out communication interaction one time, have saved the time and have improved efficient.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being made within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1, a kind of dynamic host configuration protocol DHCP relaying is the method for dhcp client request IP address, it is characterized in that, gateway Internet protocol IP address is set or/and the corresponding relation of the address pool of network segment address and an above IP of storage address in Dynamic Host Configuration Protocol server, at DHCP relay more than one gateway ip address or more than one network segment address are set, this method also comprises:
The configuring request message that A, DHCP relay send to dhcp client by broadcast reception, in this configuring request message, fill set more than one gateway ip address or more than one network segment address after, send to Dynamic Host Configuration Protocol server;
Determine the gateway ip address or the network segment address of sub-network under this dhcp client in gateway ip address that B, Dynamic Host Configuration Protocol server are filled or the network segment address from this configuring request message, to dhcp client distribute the IP address in definite gateway ip address or the network segment address corresponding address pond, institute's IP address allocated is sent to dhcp client by DHCP relay.
2, the method for claim 1 is characterized in that, describedly at DHCP relay more than one gateway ip address is set and comprises a primary gateway IP address and more than one from gateway ip address.
3, the method for claim 1 is characterized in that, described configuring request message also carries the information of dhcp client, and step B is described to determine that the gateway ip address of the affiliated sub-network of this dhcp client or the process of network segment address are:
Determine the gateway ip address or the network segment address of sub-network under this dhcp client in gateway ip address that the information of the dhcp client that Dynamic Host Configuration Protocol server carries according to this configuring request message is filled according to the rule of setting or the network segment address from this configuring request message.
4, the method for claim 1 is characterized in that, the set more than one gateway ip address of the described filling of steps A or more than one network segment address are set all gateway ip address or all network segment addresses.
5, the method for claim 1 is characterized in that, the described institute of step B IP address allocated is carried in the configuration messages and sends.
6, the method for claim 1 is characterized in that, when in described configuring request message, filling more than one gateway ip address, step B is described institute's IP address allocated is sent to dhcp client by DHCP relay before, this method also comprises:
Dynamic Host Configuration Protocol server sends to dhcp client with the gateway ip address of determining by DHCP relay.
7, method as claimed in claim 6 is characterized in that, described definite gateway ip address is carried in the configuration messages and sends.
8, the method for claim 1 is characterized in that, when in described configuring request message, filling more than one network segment address, step B is described institute's IP address allocated is sent to dhcp client by DHCP relay before, this method also comprises:
Dynamic Host Configuration Protocol server obtains the gateway ip address in corresponding address pond, and the gateway ip address in corresponding address pond is sent to dhcp client by DHCP relay.
9, method as claimed in claim 8 is characterized in that, the gateway ip address in described corresponding address pond is carried in the configuration messages and sends.
10, the method for claim 1 is characterized in that, the described set more than one gateway ip address of steps A is filled into the sub-option that is provided with in the relay agent information Relay AgentInformation option of configuring request message;
Perhaps the described set more than one network segment address of steps A is filled into the subnet that is provided with in the configuring request message and selects Subnet Selection option.
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