I had a colleague send me his Windows XP Pro PC from another branch to have memory upgraded while he was on vacation. To make sure all was well, I connected it to my network, and changed the IP address, the gateway and the DNS. I was able to browse the Internet through my router here.
The PC was returned to its home office, and we changed the IP address, the gateway and the DNS to the original settings. However, we could not access the web. He can see the shared network drive and printer in his Network Places. We can ping all the PCs. We can ping the router that leads to our private frame relay network for UNIX, but not the router for the Internet. When I got the ISP involved, they said they could see the PC's MAC address in the ARP table of their router, but could not ping this PC. They can ping everyone else.
I have removed the network card driver, and performed
netsh int ip reset reset.txt. The log entries show quite a few changes, but we still cannot ping this one stupid address. I disabled the IPSec service, to no avail. There is no ICF running. This PC has Norton Antivirus 2002, and no firewall software.
The ISP tech support has run out of ideas, so I am turning to you guys to see what to try next.