Windows XP SP3, Dell laptop. Cannot ping the default gateway, which is our router. Can ping any other computers on the subnet, either by hostname or IP. Other computers on the subnet can ping this laptop, either by IP or hostname. Cannot ping the laptop from the router. The laptop has built-in wireless. If I enable that, I can ping the router's IP address. I tried resetting TCPIP with this command: Netsh int ip reset Didn't help. Windows firewall is disabled. The computer does not appear to have any viruses. Nothing in Event Viewer. I'm stumped. Any ideas? Thanks.