Address processing method and address processing device

Abstract

The present invention provides an address processing method and an address processing device. The method is applied to a network device possessing a dynamic host configuration protocol (DHCP) snooping function, and comprises the steps of using the network device to snoop a message used for verifying whether an IP address is available and sent by a DHCP client, and recording a temporary snooping table entry correlated with the IP address according to the snooped message; using the network device to transform the snooped message into a message used for applying the IP address, and carrying an identifier DUID of a DHCP server in the transformed message and then sending the message to the DHCP server; using the network device to snoop a response message of the DHCP server returned in allusion to the message used for applying the IP address, and updating the temporary snooping table entry as an effective snooping table entry after the recorded temporary snooping table entry is found to be correlated with the IP address in the response message, and enabling the DHCP client to access a local area network normally based on the effective snooping table entry.

Description

technical field [0001] The present application relates to network communication technology, in particular to an address processing method and device. Background technique [0002] Dynamic Host Configuration Protocol (DHCP: Dynamic Host Configuration Protocol), which adopts the client / server communication mode, the DHCP client (Client) makes a configuration request to the DHCP server (Server), such as applying for an IP address, etc., and the DHCP server returns to the DHCP client The requested configuration information, such as IP address, etc., so as to realize the dynamic configuration of the configuration information. [0003] In a DHCP application network, for security reasons, a network device with a DHCP snooping (Snooping) function (DHCPSnooping device for short) is often deployed between the DHCP client and the DHCP server. Such as figure 1 As shown in the figure, the port connected to the DHCP server on the network device needs to be configured as Trusted, so that...

AI Technical Summary

Problems solved by technology

[0008] 3. When the IP address in the Confirm message fails the test, the lease of the IP address will not be recorded, and no response message will be returned to the DHCP Client

[0009] From the three response methods described above, it can be seen that the DHCP Server either returns a response message to the DHCP client that initiated the Confirm message, but the response message does not carry the IA option, or the DHCP Server does not send a response message to the DHCP client that initiated the Confirm message. The client returns a reply message, but no matter what the situation is, the DHCP snooping device cannot obtain the IP address confirmed by the confirm message and passed the test of the DHCP server. As a result, the DHCP snooping device cannot establish a snooping entry associated with the IP address, affecting The DHCP Client cannot access the LAN through the IP address confirmed by the Confirm message and passed the DHCP server test based on the snooping entry.

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