Today I discovered some additional information in regard to this issue. I am using Virt-Manager and KVM, I have a Br0 bridge configured to start onboot. When this is the case name resolution as above fails.
If I delete the bridge using VMM name resolution starts working ( after a reboot ). Put the bridge back in and it fails. I do have 3 network interfaces, 1 wlan, 1 ethernet, and and additional usb ethernet configured as eth1. I've configured the 3 interfaces using a persistent-rules file in /etc/udev/rules.d/ so that they bind to eth0, wlan0 and eth1. By configuring my VMM Br0 interface to Hotplug, so that it does not start onboot, this has resolved the issue. However, on Ubuntu 16.04 everything worked as expected including having the Br0 bridge start onboot. Can't say I understand what magic SystemD witchcraft is going up here, but I hope the above info provides some useful clues. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1624320 Title: systemd-resolved appends 127.0.0.53 to resolv.conf alongside existing entries Status in systemd package in Ubuntu: Confirmed Bug description: systemd-resolved, or more precisely the hook script /lib/systemd/system/systemd-resolved.service.d/resolvconf.conf, causes resolvconf to add 127.0.0.53 to the set of nameservers in /etc/resolv.conf alongside the other nameservers. That makes no sense because systemd-resolved sets up 127.0.0.53 as a proxy for those other nameservers. The effect is similar to bug 1624071 but for applications doing their own DNS lookups. It breaks any DNSSEC validation that systemd-resolved tries to do; applications will failover to the other nameservers, bypassing validation failures. And it makes failing queries take twice as long. /etc/resolv.conf should have only 127.0.0.53 when systemd-resolved is active. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1624320/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
