We have a DNS server internally that looks up IP addresses for all internal hosts and connects to root dns servers for all other domains (the rest of the internet). Here is my config

options {
    listen-on port 53 { 127.0.0.1;any; };
    listen-on-v6 port 53 { ::1; };
    directory       "/var/named";
    dump-file       "/var/named/data/cache_dump.db";
    statistics-file "/var/named/data/named_stats.txt";
    memstatistics-file "/var/named/data/named_mem_stats.txt";
    allow-query     {192.168.1.0/24; 127.0.0.1; };
    recursion yes;
};

logging {
        channel default_debug {
                file "data/named.run";
                severity dynamic;
        };
};

view “internal” { // What the home network will see

   match-clients      { 127.0.0.1;any; };
   match-destinations { 127.0.0.1;any; };

   recursion yes;

   zone "." IN {
        type hint;
        file "named.ca";
   };

   include "internal_zones.conf";
};

We need to tweak this to go to our ISPs dns, x.y.z.w instead of the root dns servers if the host cannot be resolved internally.

Config:

Fedora 10/Bind 9.5.2