dns and multiple subnets

I have a configuration that for the sake of discussion looks like this:

Internet-----------
...................| (forgive, google.)
10.0.0.0->[10.0.0.1 10.0.1.1]<-10.0.1.0

The box in the middle is a linux gateway/dns/dhcp. It is also a sort
of captured portal based on a blackhole DNS (netreg).

Currently I have all outbound traffic from unregistered hosts going to
10.0.0.1 from the 10.0.0.0 network. We want to add the 10.0.1.0
network and the only thing I can think of right now is that all
captured traffic still has to go to 10.0.0.1 because I can't find a way
to set up DNS to do both.

Is there a way to use DNS and pass a particular IP based on the subnet
of the requesting host? So that if 10.0.1.25 wanted www.google.com
they would get IP 10.0.1.1 instead of 10.0.0.1.

Current applicable settings are:
named.conf:
server 10.0.0.1 {
bogus yes;
};

options {
directory "/var/bind";
pid-file "/var/run/named/named.pid";
};


db.root:

$TTL 3600

.. IN SOA netreg.stmartin.edu root.netreg.stmartin.edu (
2 ; serial
10800 ; refresh
3600 ; retry
604800 ; expire
86400 ; default_ttl
)

IN NS netreg.stmartin.edu
netreg 86400 IN A 10.0.0.1
*. 86400 IN A 10.0.0.1

So I would need something for *. that would go to 10.0.1.1 for the
10.0.1.0 network.

> So I would need something for *. that would go to 10.0.1.1 for the
> 10.0.1.0 network.


You can do this with Bind 9.x.
Have a look at named.conf man page, and search for "Resource Record
sorting".

Vincent.

--
Kelkoo Security Manager / Networks & Systems Architect
JID: portsentry@jabber.kelkoo.net / Vincent.Jaussaud.AT.kelkoo.DOT.net
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