Background: *Cable modem connected to Linksys wireless router *1 WinXP machine wired to router *1 WinXP machine wireless to router *No firewall software on either machine, Internet works on both machines The wireless computer gets an IP address from the router and the Internet works fine. I can use the wired computer to access the router's list attached computers and the wireless machine is listed with the right IP address. So far so good. Problem: The wireless computer cannot ping the router or the wired computer. The wired computer cannot ping the wireless computer. Each computer can see itself in network places but not the other. Entering "\\hostname" in an explorer address bar fails. Its as if there's a firewall on one or both of the machines but there's not. The weirded part to me is that the wireless cannot ping the router, yet it can access the net just fine through it. Yes, I'm sure its connected to the right wireless lan.