Use Linux server NAT gateway for Windows domain?

Well, I'm kinda new to this...
I don't have a hardware router appliance, and I am short on Windows licences, so I figured that a Linux box would make a cheap NAT router (and firewall). I remembered that Linux generally can supply DNS & DHCP out of the box - but come to think of it, they are both optional.
I didn't stop to think that the DHCP could be on the windows domain controller, but I guess it would make excellent sense to keep AD & DNS & DHCP all together on one DC... the linux box would just become a 'router appliance', nothing more.
The second DC just DNS and AD, no DHCP - and both of them ( andall clients) pointing to the inside IP of the Linux box as the gateway. 
Thanks very much for all the suggestions, I think I'm on track now :-)

We're short on machines and I want to set up a lab network.
I have a 2008R2 and a 2008Standard that I want to use as domain controllers (R2 as 'primary', so to speak).
I understand its bad practice to make DC's multi-homed, but need to set up an internet gateway to my lab network - and I was wondering if it's possible to use a handy Linux box (Centos 6) as the NAT gateway & DHCP. (Using the Linux box as an Internet gateway for my Windows domain)
Has anybody ever done this successfully? I guess the trick would be getting DNS updates passed to the Windows NS from the Linux DHCP server??
This topic first appeared in the Spiceworks Community

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