Configure Router and 2nd NIC in SBS2003

Recently setup SBS 2003 and not sure how to configure a 2nd NIC for use with an ADSL router. The server is dealing with DHCP and I don't want it to be DNS but rather route to the 2nd NIC and thence to the Router acting as DNS.

This is what I have so far

DLink WAG54GP2 VOIP Router

Currently Dynamic IP 192.168.1.254
Currently NAT on but can be disabled
Also RIP currently disabled

Server 2003 has two network cards
For internal use Dynamic
IP 192.168.1.1
SUb 255.255.255.0
Gateway 192.168.1.254
Preffered DNS 192.168.1.254

When connected the router status displays

IP address 212.159.26.21
Subnet 255.255.255.255
Gateway 195.166.128.64
DNS1 212.159.6.9
DNS2 212.159.6.10

these settings seem to remain unchanged over time and router resetting.

And the staic IP assigned by my ISP is

IP address 212.159.26.21
Subnet 255.255.255.255


What I would like to do is configure the Router to act as DNS using the second NIC but I'm not sure what settings to define for the NIC

I have recieved the following from my ISP

"In order to use the static IP addresses, you should set your router/server/device which keeps a connection to us to use a Dynamic IP address. We will then simply assign you the same IP address each time you connect. "

Does this mean the current 192.168.1.254 should be changed, and if so to what, the static IP 212.159.26.21?

What then should the config be for the NIC2

 

Couple of problems here.

SBS must have the server set as the primary DNS server
SBS has server 2003 at its core. Have a look at this post for why you MUST use the server as the primary DNS and how to set it up to work with your ISP's DNS server.

You need two internal networks if you are dual hosting
Personally, I would not let an SBS server near an internet connection without a firewall in between. If you install a decent firewall, you don't need to dual-host the server (that is you don't need the second network connection in the server).

However, if you go the dual host route, you need two networks. One between your server and the internal PCs it servers, the other between the router and the server.

So if you use 192.168.1.0 for your internal network, the network between the router and server needs to be something like 192.168.100.0. (Personally, I'd put the internal network on a nice big subnet like 10.0.0.0/255.255.0.0 and use the 192.168.0.0 address space for the network between the server and the router. However, if this is not a new system changing the IP addresses may be a pain.)

Therefore, set the second server NIC as 192.168.100.1 and the internal network port on the router as 192.168.100.2.

I've recently posted more thoughts on this sort of thing in this thread and you may find those useful.