A detection method a detection device of IP address conflict

Abstract

An embodiment of the invention provides a detection method and a detection device of Internet Protocol (IP) address conflict, wherein the method comprises the steps of receiving a free ARP message; if a source IP address of the ARP message is identical with own IP address, constructing the free ARP message with the IP address as the source IP address and broadcasting; and judging whether there exist over two IP address conflicts in the network according to the reply of the ARP request message. The IP address detection method provided in the embodiment of the invention allows a host in Ethernet LAN to actively broadcast the ARP free message if the received free ARP message has an IP address identical to that of the host, and accordingly is capable of automatically repairing traffic anomaly caused by the IP conflict and quickly finding and positioning over two IP address conflicts existing in the network, thereby improving the reliability of the network.

Description

technical field [0001] The invention relates to the field of network communication, in particular to an Internet Protocol IP address conflict detection method and equipment. Background technique [0002] With the continuous development of network technology, network applications have become more and more popular. There are various network devices in the network at present. Although they run different operating systems, the Transmission Control Protocol / Internet Protocol TCP / IP protocol suite allows them to communicate with each other. The TCP / IP protocol family is a combination of multiple protocols at different levels. Each layer is responsible for different functions. The data link layer usually includes the device driver in the operating system and the corresponding network interface card in the computer. Together, they Deals with the details of the physical interface to the cable or any other transmission medium. The data link layer has a physical address, that is, a M...

AI Technical Summary

Problems solved by technology

In the gratuitous ARP method, when the host 101 is configured with the same IP address 1.1.1.1 as the host 102, the host 101 will broadcast and send a gratuitous ARP message to the host 102 and the host 103. At this time, the host 103 will update itself according to the gratuitous ARP message host 102 will reply an ARP response message to host 101, informing host 101 that there is an IP address conflict, but only host 101 and host 102 know about the IP address conflict, while host 103 cannot know, thus causing host 101 to Traffic sent to host 1.1.1.1 on 103 will be sent to host 101 by mistake

[0004] The problem with the gratuitous ARP method is that after an IP address conflict occurs in the network, other network elements except the network element where the IP address conflict occurs cannot be informed in time that there is an IP address conflict in the network, and the IP conflict cannot be self-healed, so that Normal network communication is greatly affected

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