Client access method, equipment and system

Abstract

The invention discloses a client access method, equipment and a system. The method comprises the following steps that: DHCP snooping equipment receives a message transmitted by a client through network trunk equipment and learns the MAC address of the client from the message; the DHCP snooping equipment uses the learned MAC address and the access port identifier of the client to match with locally stored binding relationship information; when the learned MAC address and the access port identifier of the client are not matched with the binding relationship information, a notice for reassigning an IP address for the client is transmitted to a DHCP server; when the DHCP server inquires that the IP address is assigned to the client, a process for reassigning the IP address to the client is initiated; and in the process that the DHCP snooping equipment reassigns the IP address to the client, the binding relationship information containing the MAC address and the access port identifier of the client is generated. The invention ensures that the client can use the reassigned IP address to normally communicate with the DHCP snooping equipment through the network trunk equipment.

Description

technical field [0001] The present invention relates to the field of network communication, in particular to a client access method, device and system. Background technique [0002] The Dynamic Host Configuration Protocol (DHCP) snooping (DHCP Snooping) technology is a security feature of DHCP, which filters untrustworthy DHCP information by establishing and maintaining DHCP Snooping binding entries. [0003] In a DHCP V6 environment, the typical network topology relationship of DHCP Snooping is as follows: figure 1 shown, including the client, DHCP snooping device, and DHCP server. The IPv6 address obtained by the client is in the same network segment as the IP address of the DHCP server. The DHCP Snooping device monitors and filters the response message from the DHCP server by setting the uplink port as a trusted port. The DHCPv6 Server response packet incoming from the untrusted port will be discarded. After the client successfully obtains an IPv6 address from the DHCP...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a client access method, device and system to solve the problem in the prior art that the client connects to the DHCP Snooping device through a network relay device and has obtained an IP address from the DHCP server. When the port connected to the network relay device on the Snooping device changes, the client cannot use the IP address assigned by the DHCP server to access the network normally

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