Hi, We have downsized the company in recent months and have sub let some of our office space. A second company is moving in and are bringing their own server and are going to run it over the same cabling as our machines use. What problems can anyone foresee us having if they run their domain controller (Server 2008 R2) on our LAN using the same address space. Our Domain is controlled from a single box running Small Business Server 2008. Example of the setup: SBSDomain1 - 172.16.3.1 -> 125 NewDoamin2 - 172.16.3.150 -> 200 Will this work? Also we are going to share our internet connection with them, I assume its as simple as telling their machines that the gateway is on 172.16.3.254?