Cool! Set up RRAS on a W2K3 server (SERVER4) that sits between my FSMO (SERVER3) and child domain controller (SERVER5). Deleted the child domain by running DCPROMO, rebooted and DCPROMO-ed again to a 2nd DC in the domain. Next step is to set up sites.

Procedure: SERVER4 was configured with two static routes. Step uno was to add a 2nd NIC, set IP addy (172.16.0.1,sub "B"), no default gateway. (Already had a NIC with IP addy of 10.0.0.2, sub "A")
Run RRAS wizard - choose custom, LAN routing. Add a static route for 10.0.0.0 to route to 10.0.0.2 and second static route for 172.16.0.0 to route to 172.16.0.1.

Also set SERVER3 (single NIC, IP addy 10.0.0.1) default gateway to 10.0.0.2. Same with SERVER5 which has IP addy 172.16.0.3) default gateway to 172.16.0.1. It was a lot easier to set up that I thought!

- Windows Server 2003 Support Center...excellent! KBs, How-tos, webcasts etc.
- Easy to understand guide on subnetting which means I won't have to rely as much on Solar Winds Subnet Calc