I have a DNS server running on a linux machine on my LAN which has domains for a few devices in my LAN. The resolve.conf file has google and the isp nameservers in it, as well as itself. Dunno if that helps or hinders but this setup has worked for years.

I used to have a Thomson 585 ADSL router where I set the internal DNS Server as the primary DNS and the ISPs DNS server as the secondary. True enough all connected devices could access domains specified in the internal DNS.

Recently I had to replace the Thomson router with a Netgear DGND3700 (N600) ADSL router. The problem is that if I specify the internal DNS server in this router, I lose internet connection as well as connection to the router itself.

Does anyone know how I can use the internal DNS as the primary in the router?