I am trying to build a cheap hotspot for a friend of mine who owns a restaurant with the equipment I have. He has an existing D-LINK router which has a private IP of 192.168.0.1, a computer using 192.168.0.2 and a Camera system using 192.168.0.3. I decided to pick up a Linksys WRT54G V6 and double NAT it on purpose. I set an IP of 10.0.0.1 on the LINKSYS, enabled DHCP and turned on the unsecured wireless. I plugged the WAN port of the Linksys in to the one of the LAN ports of the D-Link and it works great. His customers can pick up the wireless and use the Internet and as of yet I have no heard any complaints even though itâ€™s a double nat. The reason I did it on a double nat was obviously to keep the people on the wireless separated from the ownerâ€™s computer and the camera system. BUT it appears that even though you get a 10.0.0.x IP, with a 10.0.0.1 gateway from the DHCP server of the LINKSYS, you can access 192.168.0.x network like you are on it. An example is, if you connect to the wirelessly you get an ip such as 10.0.0.100. You can go to your run box and type \\192.168.0.2 and with a password you gain access to the ownerâ€™s computer. In an attempt to see where the problem lies I have changed the stock firmware of the Linksys to DD-WRT v24. I have also changed out the D-Link for another Linksys running DD-WRT but still have the same problem. All settings are pretty much defaults, I have tried turning on AP isolation but I believe that is only for wireless to wireless communication Any ideas other than going out and buying a different piece of equipment?