On Mon, Jan 25, 2010 at 7:05 AM, Thompson, Andrew <andrew at fernico dot com> wrote:
> Hi,
>
> I used the DNS Forwarder "override entire domain" feature for the first time the other day. I
wanted to forward all DNS queries for our corporate network domain to our corporate network DNS
server, the network is accessible over a IPSec VPN link so I entered in the local IP and presumed it
would work over the VPN, it did not. I ended up forwarding it to the public IP of one of our DNS
servers and configured the firewalls on either end appropriately.
>

You need the route described here:
http://doc.m0n0.ch/handbook/faq-snmpovervpn.html