Address processing method and device

Abstract

This application provides an address processing method and device. Wherein, the method is applied to a network device with a DHCP snooping snooping function, including: the network device listens to a message sent by a DHCP client to confirm whether the IP address is available, and records the associated information according to the intercepted message. The temporary snooping entry of the IP address; the network device converts the intercepted message into a message for applying for an IP address, and carries the DUID of the DHCP server in the converted message and sends it to the DHCP Server; the network device listens to the response message returned by the DHCP server for the message used to apply for an IP address, and finds that there is a temporary snooping associated with the IP address in the response message in the recorded temporary snooping entry entry, then update the existing temporary snooping entry to a valid snooping entry, so that the DHCP client can normally access the local area network based on the effective snooping 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. like 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 th...

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 is not recorded, and no response message is returned to the DHCPClient

[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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