Phantom LAN connection
Posted on 2004-04-27
This is a difficult scenario since I can't replicate this problem at will. I have a computer setup in a remote office that will lose its connection to the web whenever it "wants" to. This is a small office setup behind a Cisco firewall and DSL modem. There are no servers, just the Cisco router. The computer worked fine for the 2.5 years we've had it. Well, about a month ago it started losing it's connection to the web. It will still get an ip ok - It get's the 192.168.x.x IP range. I had them ping 127.0.0.1, and the card quickly without any packet loss. It talks to the gateway just fine. It always gets an IP address and the gateway address. I ran the ipconfig /flushdns - ipconfig /registerdns command, but still no results. The computer has been rebooted, which worked on time, the router has been turned off and then on several times, which seemed to work once or twice, and I'm out of ideas. One of the things that is confusing about it is that the user would use it one day, wouldn't do anything different to the computer itself, and the next day (or maybe even an hour later), he may or may not be able to get a connection. Something similar happened to another computer here in the main office. I could get a connection to my domain server and get an ip address like 192.168.x.x, but it all of the sudden was not able to connect to the web. I tried flushing the DNS and re-registering it, but nothing worked. It wasn't a big deal at the time because we were sending it to a remote office to be used by another user, so were just reformatted it, and it has worked fine ever since.
I'm sure it's something simple, like some sort of routing table, that is messed up, but I don't know what else to do. I would prefer suggestions NOT related to replacing the NIC. I don't think the NIC is the problem since there is no packet loss to 127.0.0.1, and good response time. I've had NICS go out before, but this is something different from a bad NIC.
This machine is running Windows 2000 Professional. So was the one that gave us problems a couple months ago. There are other computers in this remote office that get a connection just fine. I'm almost 100% sure that something just needs reset, but I'll let you more experienced experts tell me what it is! Thanks!