DNS Woes
Still no joy setting up second DNS server. Here's the lab set-up:

I've AD-integrated DNS and have implemented Sites on two subnets. The current setup is fine but I want to add a second DNS server to the mix. Here's the setup, all 2003 Servers, single domain.

Site#1 - 10.0.0.0 with SERVER1 as DC
Site#2 - 172.16.0.0 with SERVER3 as DC

SERVER1 hold all FSMO roles, IP = 10.0.0.1
SERVER2 is configured as with RRAS, two NICS with IP = 10.0.0.2 & IP = 172.16.0.1
SERVER3 is a DC (IP = 172.16.0.2)
(the default subnet masks are used)

SERVER1 points to itself for DNS and has a default gateway of 10.0.0.2
SERVER3 points to SERVER1 for DNS and has a default gateway of 10.0.0.2

Everything's fine with the above setup - GPOs processing, replication is good, no red Xs in Event Viewer etc.
When I ran DCPROMO on SERVER3 the NS and A records were automatically created in the forward lookup zone on SERVER1

Now I need SERVER3 to be able to resolve 172.16.0.0 addresses for Site #2....
...to be continued