sundance-communications.com/forum Forums VOIP Phones & IP PBX Networking Gateway Routing Issue

Does he have VMWare installed? I've found that the default VMWare network settings sometimes conflict with some of the SOHO routers, although if he's able to browse the lan, that is probably not the problem.

Well I think I've got it resolved. I finally got my hands on them today and the problem got even more bizarre. On my network they worked flawlessly, so I took both of them back over to the client's house. Sure enough when I got over there the problems popped up again, however my laptops worked fine from his network, so I rebuilt the TCP Stack, and then upgraded all the network drivers just as a precaution. By the time I got done they seemed to be fine. The real test will come when he gets them back to the law firm tomorrow morning and we find out if they work there.

Thanks for all the input guys.

I would also try to find out whether the customer uninstalled something recently. Also, run an antivirus & antispyware check on the laptops and the network. There is a somewhat obscure part of Windows networking called "Winsock" that provides "jacks" for 3rd party network extensions (called LSPs), to plug into. Occasionally, when the 3rd party software is uninstalled, the "plugs" fail to remove. Also, spyware often plugs into these software "jacks".
If this is the case, (and I'm not sure it is, but it looks like it), it wouldn't be a bad idea to run a complete scan on your net too.
There is a way to tell whether the problem is a Winsock LSP gone bad:

You need to install the XP Support Tools on the Windows CD (browse to \Support\Tools, run Setup.exe). Then, open a command window and enter:
netdiag /test:winsock /v.
If the diag found a problem, open a command window and type:
netsh winsock reset
Then immediately restart the computer.
After restart you should reinstall the TCP stack.
This should do it. The above work only on Win XP SP2.
Mind you, there's a chance Winsock was reset after you reinstalled the drivers.