no network after replacing mobo

[silk1976]

Hi -

SO I just replaced my motherboard because my old one bit the dust... I replaced an Epox 8rda+ with a DFI NFII ultra. Both boards use the same nforce2 chipset, so loading windows was no problem (no inaccessible boot device BSOD). However, I can't seem to get the NIC adapter to respond.

I try to ping other machines on my network, and i can see the switch blinking with activity, but pings come back with no response. I can't ping the machine in question from other machines either.

I'm thinking there may be a conflict somewhere. After putting in the new mobo, I went to set my ethernet settings, and when I put in the fixed IP of the machine, it came back and said that the IP was already in use by a hidden device. So I went into the control panel and went to 'add/remove devices'. I noticed that for many devices, they showed up twice (presumably once for the old mobo, and once for the new one). So I uninstalled the nforce drivers, thinking that might help clear out the old NIC information. I reinstalled the drivers and when I went to set the ip information again, it took it without the complaint that it was already in use.

Any ideas of why the ethernet traffic isn't getting anywhere?

 

[bcastner]

Try rebuilding your Winsock service stacks. This utility should sort the issue for you:

http://members.shaw.ca/techcd/VB_Projects/WinsockFix.zip

 

[silk1976]

I tried the winsockfix.zip utility, but that didn't help any. Thanks for the suggestion though!

I noticed something else in troubleshooting - if I go to another machine and ping the problem machine, I dont get a response but when I run arp -a, it shows the IP and correct MAC address for the problem machine. I'm not sure exactly how it works, but it seems like there is very basic communication going on.

 

[bcastner]

That situation describes a Firewall issue exactly. Be careful as there are "hidden" firwalls in many antivirus packages. PC-Illan would cause your issues without question if the firewall feature is not disabled.

 

[silk1976]

Problem solved. Tried reinstalling the tcp/ip stack in windows - no luck. Put in an ethernet card, configured it and it works fine. SO the problem must be in the onboard NIC I was using, as opposed to a windows tcp/ip issue.