Paul L on Nostr: Compare IPv4. Say physical host on the wired net i/f eth0 is 192.168.1.100/24 And ...
Compare IPv4.
Say physical host on the wired net i/f eth0 is 192.168.1.100/24
And guests to live on virbr1 as routed subnet of 192.168.100.0/28, with the physical host's virtual i/f at 100.1
Libvirt can distribute 192.168.100.0/28 to guests via DHCP as part of its config of virbr1
But has no role in "requesting" the /28 subnet from the upstream net nor advertising that route to wan.
So you would need to statically route 192.168.100.0/28 to 192.168.1.100 from upstream.
Say physical host on the wired net i/f eth0 is 192.168.1.100/24
And guests to live on virbr1 as routed subnet of 192.168.100.0/28, with the physical host's virtual i/f at 100.1
Libvirt can distribute 192.168.100.0/28 to guests via DHCP as part of its config of virbr1
But has no role in "requesting" the /28 subnet from the upstream net nor advertising that route to wan.
So you would need to statically route 192.168.100.0/28 to 192.168.1.100 from upstream.