Ryan, The problem is not that a recent change in resolvconf caused a regression.
The problem with resolvconf is that the upgrade to network-manager exposed an existing bug in resolvconf. This happens because the new version of network-manager now tells resolvconf that it must only use a specific interface when talking to the name server, and resolvconf was not properly tracking how interfaces were added and removed from the system. This is most obvious for VPN connections which use an interface for VPN traffic, as that interface will be destroyed and recreated on every VPN connection, triggering the bug in resolvconf. (Setting up the new DNS for the new VPN interface is insufficient to make it happy.) This can also be triggered on systems that remove and readd interfaces for things like suspend or hibernate. Redhat documented the bug fairly well when they found it, their bug report on the matter is https://bugzilla.redhat.com/show_bug.cgi?id=1373485 The actual patch that needs to be applied is git commit 2675f2061525bc954be14988d64384b74aa7bf8b, and the upstream gitweb URL for viewing the diff is: http://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=commitdiff;h=2675f2061525bc954be14988d64384b74aa7bf8b There is a separate (but very related) issue, in that some existing VPNs that involve ipsec have one interface for sending traffic and to hold an IP, but the response traffic appears on the interface of the primary internet connection. This is completely broken in the middle of an LTS by this change, and fixing the bug in resolvconf won't help. I'm still trying to sort out the right answer for some of my VPN use cases there. ** Changed in: resolvconf (Ubuntu) Status: Invalid => Confirmed -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to resolvconf in Ubuntu. https://bugs.launchpad.net/bugs/1671606 Title: DNS server from vpn connection is not being used after network-manager upgrade to 1.2.6-0ubuntu0.16.04.1 Status in network-manager package in Ubuntu: Confirmed Status in resolvconf package in Ubuntu: Confirmed Bug description: I use my company's cisco vpn via network-manager in Ubuntu 16.04.2 LTS. After recent upgrade of network-manager:amd64 from version 1.2.2-0ubuntu0.16.04.4 to version 1.2.6-0ubuntu0.16.04.1 DNS resolution of VPN's server hostnames does not work. Roll back to version 1.2.2-0ubuntu0.16.04.4 solves the problem. Steps for reproducing: 1. upgrade network-manager:amd64 from version 1.2.2-0ubuntu0.16.04.4 to version 1.2.6-0ubuntu0.16.04.1 2. connect to VPN via network-manager applet 3. nslookop servername.internal --> ** server can't find servername.internal: NXDOMAIN 4. disconnect from VPN via network-manager applet 5. roll back network-manager via command: sudo apt-get install network-manager=1.2.2-0ubuntu0.16.04.4 6. restart network-manager via sudo service network-manager restart 7. connect to VPN via network-manager applet 8. nslookop servername.internal --> the server is resolved correctly ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: network-manager 1.2.6-0ubuntu0.16.04.1 ProcVersionSignature: Ubuntu 4.4.0-66.87-generic 4.4.44 Uname: Linux 4.4.0-66-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.5 Architecture: amd64 CurrentDesktop: Unity Date: Thu Mar 9 19:49:55 2017 InstallationDate: Installed on 2015-10-05 (520 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true SourcePackage: network-manager UpgradeStatus: No upgrade log present (probably fresh install) nmcli-nm: RUNNING VERSION STATE STARTUP CONNECTIVITY NETWORKING WIFI-HW WIFI WWAN-HW WWAN running 1.2.6 connected started full enabled enabled enabled enabled enabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1671606/+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
