Re: qemu guest with tap network not working

[Michael van Elst <mlelstv%serpens.de@localhost>]

On Wed, Jul 02, 2025 at 03:17:42PM -0600, Brook Milligan wrote:
> 

> The key is that the host needs an address on the bridge in the guest?s subnet so it can route packets.

When you add the host ethernet interface to the bridge, you do not route
packets and you do not have a "guest subnet". It's all one, just like
connecting the guest to the same switch the host is connected to.

> I?m not sure what ?neither? refers to.  In my experience testing this, some interface attached to the bridge (either tap or vether) needs an IP address for routing.

Connecting to the bridge connects the interfaces on layer 2, routing
is not part of this and not required. Also, for connectivity to the
outside, a routed guest network also needs proper routes on the host
network. You can do that, but it adds lots of complexity.


Greetings,
-- 
                                Michael van Elst
Internet: mlelstv%serpens.de@localhost
                                "A potential Snark may lurk in every tree."