I'm having trouble getting IPv6 to work for my KVM/qemu guests.
I have two bridges setup, one routed (external, non libvirt) bridge for public dedicated ipv4 + ipv6 which works for both protocols.
Then I have a libvirt nat bridge (with the routed bridge as parent) with a nated ipv4 (that works) and I also want a public ipv6. I'm able to transmit udp packets out but I never get any response.
Looking at tcpdump there are incoming neighbor solicitations that get unanswered and don't get forwarded to the guest.
Do I need to set something special up for this to work? Ubuntu 22.04 / Libvirt 8.0.0
The routed bridge (pubBr) has ipv6 2001:x:x:7d8e:: - My nat bridge config below:
<network> <name>natbr</name> <bridge name="natbr" /> <forward mode='nat' dev='pubBr'> <nat> <port start='8000' end='30000'/> </nat> </forward> <ip address="10.1.1.1" netmask="255.255.0.0"> <dhcp> <range start='10.1.1.2' end='10.1.1.255'/> </dhcp> </ip> <ip family="ipv6" address="2001:x:x:7d8e::1" prefix="64"> <dhcp> <host name="test" ip="2001:x:x:7d8e:a01:2ff::"/> </dhcp> </ip> </network> Thanks!
