I'm at work with this scenario. I laptop using wireless is connected to the LAN, but cant answer to pings, cant ping anything on the lan (wan works though O_O). I tried to reset the winsock & TCP/IP settings and using new drivers. Also tried modifying the local computers routing table. Nothing works, still cant ping anything on the LAN. All firewalls are ofc off. Cannot browse the web either since I cant connect to 192.168.0.1 - DG and DNS. I am currently on the same wireless connection, and everything works, so no problems at the router. Also checked some stuffs in the router (dhcp, nat, etc) and it works there. Obvious because I can ping 4.2.2.2. Here is a screenshot that might help. Sorry it is in swedish, think you do understand anyway. Computer is .9, DG is .1, cant ping anything on the LAN.
Using Vista, thats why I posted here.
Halp!