(added users(a)lists.libvirt.org back into the Cc so that anyone else asking the same question in the future will benefit from the answer) On 3/28/25 8:12 AM, James Liu wrote: Sorry, I had meant to point this out but somehow forgot - user-specified aliases must begin with "ua-", otherwise they will be ignored. So instead of using "<alias name='foo'/>", use "<alias name='ua-foo'/>" (and then in the <qemu:arg value> use "netdev=hostua-foo") Also note that your guest should be shutdown while you're making these changes.