xref: /external/dnsmasq/contrib/openvpn

The patch I have attached lets me get the behavior I wish out of
dnsmasq.  I also include my version of dhclient-enter-hooks as
required for the switchover from pre-dnsmasq and dhclient.

On 8/16/05, Joseph Tate <dragonstrider (a] gmail.com> wrote:
> I'm trying to use dnsmasq on a laptop in order to facilitate openvpn
> connections.  As such, the only configuration option I'm concerned
> about is a single server=3D/example.com/192.168.0.1 line.
>
> The way I currently have it set up is I modified dhclient to write its
> resolv.conf data to /etc/resolv.conf.dhclient and configured
> /etc/dnsmasq.conf to look there for its upstream dns servers.
> /etc/resolv.conf is set to nameserver 127.0.0.1
>
> All of this works great.  When I start the openvpn service, it the
> routes, and queries to the domain in the server=3D line work just fine.
>
> The only problem is that the hostname for my system doesn't get set
> correctly.  With the resolv.conf data written to something other than
> /etc/resolv.conf, the ifup scripts don't have a valid dns server to do
> the ipcalc call to set the laptop's hostname.  If I start dnsmasq
> before the network comes up, something gets fubar'd.  I'm not sure how
> to describe it exactly, but network services are slow to load, and
> restarting networking and dnsmasq doesn't solve the problem.  Perhaps
> dnsmasq is answering the dhcp request when the network starts?
> Certainly not desired behavior.
>
> Anyway, my question: is there a way to have the best of both worlds?
> DHCP requests to another server, and DNS lookups that work at all
> times?
>
> My current best idea on how to solve this problem is modifying the
> dnsmasq initscript to tweak /etc/dhclient-enter-hooks to change where
> dhclient writes resolv.conf data, and fixing up /etc/resolv.conf on
> the fly to set 127.0.0.1 to the nameserver (and somehow keep the
> search domains intact), but I'm hoping that I'm just missing some key
> piece of the puzzle and that this problem has been solved before.  Any
> insights?
>
> --
> Joseph Tate
> Personal e-mail: jtate AT dragonstrider DOT com
> Web: http://www.dragonstrider.com
>