On 10/27/25 6:39 PM, Charles Curley wrote:
On Sat, 25 Oct 2025 13:17:00 -0600
Charles Curley <[email protected]> wrote:
As near as I can tell the problem with using wifi isn't wifi per se.
Apparently some wifi routers track MAC addresses. Your computer gets on
the network using its MAC address. Your virtual machines have
different MAC addresses. Linux's virtual networking is transparent,
meaning it does not play with the virtual machines' MAC addresses. So
the wifi router sees this new MAC address from the VM, and rejects it.
Apparently my wifi access points do not care about this, as I have run
VMs on laptops on my home network for years without issue. And there are
solutions out there based on ebtables.
The default network for virbr0 does that automatically but if you change
"nat" to "open" you could do everything yourself!
If you use network address translation the guest(s) will not be seen by
the upstream router but if you bridge an ethernet interface as br0 guest
will be seen as a new MAC by the upstream DHCP server.
I am considering filing a bug. I believe the libvirt folks should solve
this problem, not Debian packagers.
Before filing a bug, I would go on the Libvirt mailing list to see if
you get more input on what's going on.
--
John Doe
