A method for judging the occurrence of MAC duplication in the same network segment

This article introduces the judgment method of MAC duplication in the same network segment, the content is very detailed, interested friends can use it for reference, hope to be helpful to you.

Phenomenon:

Today, a colleague cloned a virtual machine because the original virtual machine setting is mac manual, resulting in the cloned virtual machine is the same as the original virtual machine mac, did not pay attention to change to the new mac, after enabling the virtual machine, the same IP address range machine cannot be accessed.

Troubleshooting:

Ping cannot communicate with the network segment machine, nor can it communicate with the network segment machine ping. Arp-a checks that there is no corresponding mac,arp-d to clear the historical mac, and then ping, and finds that a packet can be connected. At this time, it is estimated that the machine declares mac and causes a packet to be ping. It is estimated that the mac duplicates with the machines of the same network segment. After checking the configuration of the virtual machine, it does repeat (it can also be queried through the switch). It is normal when it is set to the new mac.

This is the end of the method of judging the occurrence of MAC duplication in the same network segment. I hope the above content can be helpful to everyone and learn more knowledge. If you think the article is good, you can share it for more people to see.