I have two office networks connected via the two models above. The single router to router tunnel is established and both routers show status as connected. Both are on static IP addresses from the ISP. I have followed the instructions in the manuals and put in the routing table to have one network see the other thru the tunnel but no sucess. I cannot ping any machines from one side to the other. But I can ping one router from the other. For that matter I can log onto each router from the other site, so there is a connection there. Both networks have different IP addresses, i.e. one is 192.168.0.nnn the other is 192.168.1.nnn. All machines are XP pro and TCPIP networked. Each individual network is fuctioning just fine. My question is do I need to make any changes to the XP machines in order to get through this tunnel. I.I Netbios, DNS, WINS etc. Please don't suggest Linksys support, I can read the manual as well as they do, because the 4 odd hours on the phone to them was listening to them read it for the first time to me. Any help, suggestions for tools, diagnostics would be most welcome. I am up to 25 hours playing with these beasts and I am frustrated to the max. I have seen some posts by Doc Large and others where you have the tunnel open and running but there must be more to do. But What???