Method and system for realizing neighbor discovery proxy based on duplicate address detection (DAD)

Abstract

The invention discloses a method and a system for realizing a neighbor discovery proxy based on duplicate address detection (DAD). The method comprises the following steps that: an access layer switchboard detects a DAD process of a host machine node, establishes and stores address information, and uploads the address information to a convergence layer switchboard; the convergence layer switchboard stores the address information into an address information table; the host machine node sends a neighbor solicitation message to the convergence layer switchboard; the convergence layer switchboard inquires the address information table; and when the address information table comprises a target Internet protocol (IP) address of the neighbor solicitation message, the convergence layer switchboard sends a neighbor advertisement message to the host machine node. According to the technical scheme, neighbor discovery proxy equipment can judge whether the IP address is actually used, so that whether the IP address can be reached is determined, and communication between a request host machine node and a target host machine node is guaranteed.

Description

technical field [0001] The invention relates to the field of computer data communication, in particular to a method and system for realizing a neighbor discovery agent based on Duplicate Address Detection (DAD). Background technique [0002] DAD is the process by which a host node determines whether an address to be used is used by another host node. Before a host node automatically configures an IPv6 unicast address for an interface, it must verify within the link-local scope that the temporary address to be used is unique and has not been used by other nodes. As long as the Neighbor Solicitation (Neighbor Solicitation) message is sent to the local link, if there is no Neighbor Advertisement (Neighbor Advertisement) message to reply within the specified time, the temporary unicast address is considered to be unique on the local link and can be assigned to the interface; otherwise, this temporary address is duplicated and cannot be assigned. [0003] If a neighbor solicita...

AI Technical Summary

Problems solved by technology

[0004] The defect of the neighbor discovery agent is that the device does not detect the reachability of the target IP, but directly sends the neighbor advertisement message to the host node that sends the neighbor request message. Mapping relationship, causing the requesting terminal to think that the destination terminal exists, but actually cannot communicate with each other

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