Nothing of the behavior for this should have changed in the last few releases with your configuration. We now explicitly install dnsmasq as a local resolver spawned by NM to facilitate handling DNS information when used with VPNs, and it does appear to work properly on my systems.
However, you're not using dnsmasq (missing dns=dnsmasq in /etc/NetworkManager/NetworkManager.conf) and have interfaces configured in /etc/network/interfaces. Please try to reproduce the issue and include debugging logs (but make sure to clean them up first, as they may contain usernames, passwords, and other sensitive data). To get debugging logs for the VPN plugins, please follow http://live.gnome.org/NetworkManager/Debugging. You might also want to attach /etc/resolv.conf, and /run/resolvconf/interface/NetworkManager so we can see what DNS servers are being installed by NetworkManager. ** Changed in: network-manager (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/993523 Title: VPN Connections Don't Replace Nameserver Status in “network-manager” package in Ubuntu: Incomplete Bug description: For both PPTP and VPNC connections from the network manager gui, the nameservers in /etc/resolv.conf no longer get replaced. Instead, it only appends the new name servers (And search domain) to the end of the file. This causes DNS to not work properly as it doesn't query the name servers given by the VPN connection first. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: network-manager 0.9.4.0-0ubuntu3 ProcVersionSignature: Ubuntu 3.2.0-24.37-generic 3.2.14 Uname: Linux 3.2.0-24-generic x86_64 NonfreeKernelModules: fglrx ApportVersion: 2.0.1-0ubuntu7 Architecture: amd64 CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. Date: Wed May 2 15:20:40 2012 IwConfig: lo no wireless extensions. eth0 no wireless extensions. tun0 no wireless extensions. NetworkManager.conf: [main] plugins=ifupdown,keyfile [ifupdown] managed=true NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=true WWANEnabled=true WimaxEnabled=true RfKill: SourcePackage: network-manager UpgradeStatus: Upgraded to precise on 2012-05-02 (0 days ago) modified.conffile..etc.NetworkManager.NetworkManager.conf: [main] plugins=ifupdown,keyfile [ifupdown] managed=true mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2012-02-28T21:12:35.862903 nmcli-con: NAME UUID TYPE TIMESTAMP TIMESTAMP-REAL AUTOCONNECT READONLY DBUS-PATH SE-NY Cisco 5c61cd44-9337-4744-9507-6d344ca87d0c vpn 1335989892 Wed 02 May 2012 03:18:12 PM EST no no /org/freedesktop/NetworkManager/Settings/2 SE-NY 70b9d278-f103-4134-ad12-8adbc84404ae vpn 1335989684 Wed 02 May 2012 03:14:44 PM EST no no /org/freedesktop/NetworkManager/Settings/1 Ifupdown (eth0) 681b428f-beaf-8932-dce4-687ed5bae28e 802-3-ethernet 1335989892 Wed 02 May 2012 03:18:12 PM EST yes yes /org/freedesktop/NetworkManager/Settings/0 nmcli-dev: DEVICE TYPE STATE DBUS-PATH eth0 802-3-ethernet connected /org/freedesktop/NetworkManager/Devices/0 nmcli-nm: RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN running 0.9.4.0 connected enabled enabled enabled enabled disabled To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/993523/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
