stale openvpn dns servers left in /etc/resolv.conf

[Seth Arnold]

I use an openvpn vpn through network manager to connect to the canonical vpn; when I suspend and resume my laptop the openvpn vpn does not come up again. However the DNS server that it inserted into my /etc/resolv.conf is left there, causing all dns lookups to take six seconds longer, until I either bring up the vpn again or hand-edit my resolv.conf.

I want the DNS server to be removed when the VPN is no longer functional. (The indicator knows the VPN is down, so presumably this is knowable.)

Thanks

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: network-manager 0.9.8.8-0ubuntu7
ProcVersionSignature: Ubuntu 3.13.0-46.79-generic 3.13.11-ckt15
Uname: Linux 3.13.0-46-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.7
Architecture: amd64
CurrentDesktop: Unity
Date: Sat Mar 14 15:27:30 2015
IfupdownConfig:
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2012-10-18 (877 days ago)
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
IpRoute:
 default via 192.168.1.1 dev wlan0 proto static
 192.168.1.0/24 dev wlan0 proto kernel scope link src 192.168.1.2 metric 9
 192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager
UpgradeStatus: Upgraded to trusty on 2014-04-12 (336 days ago)
mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2013-11-05T17:49:23
nmcli-dev:
 DEVICE TYPE STATE DBUS-PATH
 wlan0 802-11-wireless connected /org/freedesktop/NetworkManager/Devices/1
 eth0 802-3-ethernet disconnected /org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING VERSION STATE NET-ENABLED WIFI-HARDWARE WIFI WWAN-HARDWARE WWAN
 running 0.9.8.8 connected enabled enabled enabled enabled enabled