Method and system for realizing proxy address resolution protocol (ARP) based on gratuitous ARP

Abstract

The invention discloses a method for realizing a proxy address resolution protocol (ARP) based on a gratuitous ARP. The method comprises the following steps that: A, an access switchboard creates and stores host Internet protocol (IP) address information by monitoring the gratuitous ARP process of an IP host, and transmits the host IP address information to a convergence switchboard; B, the convergence switchboard receives the host IP address information, and stores the host IP address information to a host IP address information table; and C, after receiving an ARP request message transmitted by the IP host, the convergence switchboard judges whether a target IP address in the ARP request message is in the host IP address information table, if the target IP address is in the host IP address information table, the convergence switchboard transmits an ARP response message to the IP host, if the target IP address is not in the host IP address information table, the convergence switchboard discards the ARP request message. By the method, accessibility detection of a target terminal in the proxy ARP is realized.

Description

technical field [0001] The invention relates to the field of computer data communication, in particular to a method and system for realizing proxy ARP based on free ARP. Background technique [0002] The Address Resolution Protocol (Address Resolution Protocol, ARP) realizes knowing its physical address through the IP address. A gratuitous ARP (Gratuitous ARP) message is a special ARP message. The Internet Protocol (Internet Protocol, IP) address of the sender and the target IP address carried in the message are both local IP addresses, and the source media access control ( The Media Access Control (MAC) address is the local MAC address, and the destination MAC address is the broadcast address. [0003] The host realizes the following functions by sending free ARP packets: (1) Determine whether the IP address of other hosts conflicts with the IP address of the host. When other hosts receive the gratuitous ARP message, if they find that the IP address in the message is the ...

AI Technical Summary

Problems solved by technology

[0005] However, the proxy ARP has the following disadvantages: the device with the proxy ARP function directly sends an ARP response to the requesting end that sends the ARP request message without detecting the reachability of the target IP, so that the ARP cache table of the requesting end exists The mapping relationship between the IP address of the target terminal and the hardware address. The requester initiates communication with the target terminal based on this hardware relationship. However, because the reachability of the target IP is not detected, the target terminal may not exist, and the communication cannot be completed in the end.

Images