this post was submitted on 10 Aug 2024
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Unless there's something wonky with your virsh configuration, no.
This is a shitty explanation and if anyone would like to explain it better feel free, but the bridge interface acts as sorta like a network switch that can forward packets as well as be used for an interface, if configured.
What that means is, essentially, your VMs will be attaching their ethernet devices to a "switch" that then routes the packets out to the local LAN as if it were, well, a nic plugged into a switch.
virsh shouldn't assign an in-use MAC, as it generates a random one (and I have no idea what you'd have to do to make them not do that) so everything should... just work.