On 11/06/15 10:47, changzhi wrote:
Hi, all.
I create a vm and it's neutron port's mac address is
"fa:16:3e:3f:02:ff". I see "fa:16:3e:3f:02:ff" inside vm when I run
"ifconfig eth0". Why does vm's tap device's mac address is
"fe:16:3e:3f:02:ff"? Why different between neutron port's mac address
and tap device's mac address? Does libvirt create instance tap device
and its mac address is generated randomly?
Thx
zhi
There are two MAC addresses, one at each end of the link between the
host and the VM.
-------------------+
Host | +-------------------+
| | VM |
tap12345-CD ------------------- eth0 |
fa:16:3e:56:71:42 | | fa:16:3e:3f:02:ff |
| | |
| +-------------------+
-------------------+
I believe that both of these addresses are randomly generated, although
I'm not sure exactly which components do that.
Does that help at all?
Thanks,
Neil
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