Re: VPN + dnsmasq = split dns?

[Olav Morken <olavmrk gmail com>]

On Tue, Dec 02, 2014 at 15:30:09 -0500, Mathieu Trudel-Lapierre wrote:
> On Tue, Dec 2, 2014 at 1:24 PM, Olav Morken <olavmrk gmail com> wrote:
> [...]
> > > I don't think it makes sense. Running a local DNS cache is good for
> > > other reasons as well and I don't see a reason to drop dnsmasq just
> > > because you are connected to a VPN. Or did I misunderstand? What
> > > exactly is the problem with upstream NM and could we have a bug
> > > report for it?
> >
> > Ubuntu doesn't drop dnsmasq when running on a VPN. By default, Network
> > Manager assumes that if you are running dnsmasq you want split DNS
> > with your VPN. That includes if you have a default route over your
> > VPN. Since that breaks DNS when you connect to your VPN, Ubuntu has a
> > fix for it, which involves disabling split DNS in that case. My
> > problem was that the fix wasn't complete.
>
> Actually, I wrote at least some of the patches. The intent was that it
> should work just as well if the default gateway goes through the VPN
> (ie. no split-tunnel).
>
> If it doesn't work, that's a bug you can file on Launchpad against the
> network-manager package (but I'm going to take a good look now since I
> want to upstream these patches).

I already did:

  https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1390623

Basically, as far as I can tell, the problem is when you have both
IPv6 and IPv4, but only provide IPv4 DNS servers. The IPv4 DNS servers
were added with split DNS in my case.

Best regards,
Olav Morken