I am going to be implementing a hardware VPN solution utilizing something along the lines of a cisco pix or sonicwall. I have dont the VPN setup before, on a unix platform. This time around I will be doing it on a windows platform. What is the best way to extend a domain over a site to site VPN? Is there any good documentation about it? I have found tons of stuff on VPN's just nothing specific on site to site VPN's with a win2k3 domain running over them. I understand each side has to have a distinct subnet associated with it, but how do I make the connection for the AD information and such to traverse the VPN?