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This article mainly introduces what is the mac address of instance in openstack. It is very detailed and has certain reference value. Friends who are interested must finish reading it.

Suppose the mac address you see in the virtual machine using ifconfig is A, then ssh the virtual machine on any other machine (the floating ip to which it is connected), and then disconnect, using the arp-n command, suppose that the mac address corresponding to the floating ip you see is B, according to common sense, but in fact A! = B. The address of B is the network exit address of the Linux virtual network where the virtual machine is located. With the command quantum router-port-list routename, you can see that all the virtual machine addresses under the virtual network see the same mac address on the outside, which is the exit address of the virtual network.

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