Re: relation between "virbr0" / "virbr0-nic" network interfaces

On Fri, Jan 01, 2021 at 10:24:41AM +0100, vrms wrote: > I am trying to understand KVM networking a little better and have noted > that the "virbr0" network interface (the default KVM bridge) comes with > another device named "virbr0-nic". > The same kind of pair comes with each new bridge you may create via the > "virtual machine manager" (and assumingly other KVM tools alike) > Like "virbr1" comes in a pair with "virbr1-nic" (the *-nic interface is > being created automatically (and I assume will disapear automatically if > you remove the parent interface) > > Can anybody kindly explain how these pairs are related to each other > and/or work together? The "$FOO-nic" device is a tap device created as a hack to force a stable MAC address on the main bridge device due to bad kernel impl of bridge device MAC address assignment. We stopped creating the "$FOO-nic" device in libvirt 6.8.0 since the kernel was long ago fixed. Regards, Daniel