Networking Troubles

[ocbo41]

I have a somewhat odd networking setup, I get the internet through a USB AT&T 3g card on my mac pro. To send it out I have internet sharing on, and send it out the ethernet port to a wireless router with its DCHP off. Before I would have a static IP with DCHP on my macpro and it would be great, wireless laptops can pick up the internet as well as a hardwired emac.

Trouble is that I just moved out and the at&t usb card is being run on the emac with 10.4.11. Now using the same setup as before, the Vista laptop can not get internet, nothing has else has changed though. I can ping the emac on the vista machine and they talk. I can not ping the Vista machine on the emac though. I get this error in terminal:
"PING 192.168.2.2 (192.168.2.2): 56 data bytes
ping: sendto: No route to host
ping: sendto: Host is down
ping: sendto: Host is down "


My emacs lan ip is 192.168.2.3
Vista firewall is off
Network discovery is on, as well as file sharing

Any suggestions?

 

[ocbo41]

any ideas?

 

[poisonapple]

What is the default gateway on the Vista machine? Do an ipconfig /all from the cmd prompt in Vista.