Forward only some subdomains?

[Kyng Chaos]

I've had this setup working nicely for quite a while, but our ISP just 
threw a wrench into the works.

Our ISP handles our DNS (for the outside Internet world) and email.  We 
handle web and ftp on our server (behind a NAT router).  Internally, I 
have a DNS server set up with the same domain name - mostly so that 
internal queries get a local IP for our web pages.  It is set up to 
forward all queries except for our domain name.

Before, we checked and sent our mail with our ISP's domain name 
(pop.chartermi.net, smtp.chartermi.net), but now they want us to use 
pop.ourdomain.com and smtp.ourdoamin.com.  Since our internal DNS 
catches all ourdomain.com queries, we can't get an IP for pop. and smtp.

So, is there a way to forward certain subdomain queries and catch all 
others?  Bind 9.2.2

Currently the named.conf looks like:

options {
    directory "/var/named";
    allow-transfer {none;};
    recursion true;
    notify no;
    forward first;
    forwarders {
            24.196.64.39;
            24.196.64.40;
        };
};

- snip -

zone "ourdomain.com" IN {
    file "ourdomain.com.zone";
    type master;
    forwarders {};
};

zone "1.168.192.in-addr.arpa" IN {
    file "1.168.192.in-addr.arpa.zone";
    type master;
    forwarders {};
};


I've tried adding a forward zone entry for pop and smtp, but that didn't 
work - no domain found.  Adding a NS entry in the zone file for pop and 
smtp just ends up timing out when asking for those.  So for now I just 
have A records for pop and smtp in the zone file, but I'm sure that's 
not the way to do it, tho it works for now.


-WoK

-- 
Don't Panic.