Your configuration looks as if you bridges the guests to an external connected bridge (br0) I assume your guests get DHCP from something else on 172.18.232.11/25 and not from the hosts DNSMASQ is that right?
If that is true please provide logs from the actual dnsserver. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1817998 Title: KVM Guest - DHCP lease lost (Ubuntu 18.04) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1817998/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs