[Bug 1046154] Re: Can't resolve OpenVPN DNS while using a 3G connection with resolvconf installed

[Thomas Hood]

> 1. This is my /etc/resolv.conf before connecting to the VPN (resolvconf installed):
> # Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
> # DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
> nameserver 195.81.137.130
> nameserver 195.81.155.194
> nameserver 127.0.0.1

This is wrong and most probably the cause of your problem.  There should
not be entries before "nameserver 127.0.0.1".

We need to figure out where those entries are coming from.

Please reproduce this case (i.e., install resolvconf; reboot; connect to
Internet but not to VPN) and run the following commands in a terminal
and post the output:

    ls -l /etc/resolv.conf
    ls -l /run/resolvconf
    cat /run/resolvconf/resolv.conf
    ls -l /run/resolvconf/interface
    for F in /run/resolvconf/interface/* ; do echo === $F === ; cat $F ; done
    ls -l /etc/resolvconf/resolv.conf.d
    for F in /etc/resolvconf/resolv.conf.d/* ; do echo === $F === ; cat $F ; done
    cat /etc/resolvconf/interface-order
    cat /etc/NetworkManager/NetworkManager.conf
    cat /etc/network/interfaces
    dpkg -l resolvconf network-manager

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https://bugs.launchpad.net/bugs/1046154

Title:
  Can't resolve OpenVPN DNS while using a 3G connection with resolvconf
  installed

Status in “resolvconf” package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu version: fresh install of Ubuntu 12.04.1 LTS 64 bits (3.2.0-29-generic)
  Resolvconf package version: 1.63ubuntu15

  What I expected to happen: Connect through 3G (bluetooth DUN), connect
  to a OpenVPN and be able to resolve the internal domain names to
  access some servers.

  What happened instead: I can't resolve internal hostnames.

  Additional information: It only breaks when connecting through 3G.
  When connecting through Wifi/Cable it works perfectly.

  Workaround: Uninstalling the package resolvconf seems to solve the
  problem.

  Other users probably affected:
  http://mobilesociety.typepad.com/mobile_life/2012/07/ubuntu-1204-the-
  network-manager-3g-internet-and-vpn.html

  I've looked at other bug reports and tried other solutions:
  * #922578.  Removing "resolvconf" is a workaround that works, but I imagine this is resolvconf bug and there must be a more elegant solution.
  * #994575. This looks related, but I already have the patched version and it didn't help.
  * #924013. I have already checked that my OpenVPN servers are pushing the right information (DNS + DOMAIN) back to the client.

  With resolvconf installed: cat /etc/resolv.conf:
      nameserver 195.81.137.130
      nameserver 195.81.155.194
      nameserver 192.168.163.200
      search dummy.intranet

  With resolvconf uninstalled: cat /etc/resolv.conf
      domain dummy.intranet
      search dummy.intranet
      nameserver 127.0.0.1

  Please tell me if you need any additional information

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