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LAN connection media disconnected

Posted on 2010-01-08
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Last Modified: 2013-12-14
I have a really weird problem. My computer OS is win xp and on startup the lan is enabled but not connecting to my router automatically. I recently physically moved my computer from a cable isp to a dsl isp. In both situations the router was wired to the pc, only now that it is on dsl it will not detect a connection on startup. In order to get it to detect a connection, i have to disable the lan connection and then re-enable it. When i disable it i have to let it sit there for about 10-20 seconds before re enabling it or it will not detect it. when I did an ipconfig /all it says that the media is disabled, but after re enabling the card ipconfig /all is fine. I have already updated the drivers for the lan, its realtek. Also i have deleted it from the device manager and let windows reinstall it on startup. I have done a system restore as well to a time when the lan worked on cable. The nic card is onboard, and i dont have a pci nic card to test out on it. I have tested multiple cat 5e cables. I am lost as to what could be causing this, and any help would be greatly appreciated. Also previously another computer was wired up to the dsl router, and it worked fine. There are laptops running wirelessly on the router as well and working fine. The router is a linksys I think its the 54g.
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Question by:tallguy2682
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Expert Comment

by:aleghart
ID: 26214636
Sounds like your equipment is fighting for IP address assignment by the DHCP server.  Down everything, including your router and any device from your ISP.

Power up your problem computer first.

If it works, then it and/or another computer (printer, etc.) is trying to re-use it's IP address instead of always checking with the DHCP server first.
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Author Comment

by:tallguy2682
ID: 26214668
I thought of this also. To trouble shoot this I took a little different approach. The router uses ip addresses starting at 192.168.1.100 so i assigned a manual ip to the problem computer of 192.168.1.125 because there are only 3 computers total using the network. I still had the same problem. I will try your suggestion though and let you know how it works out.
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Expert Comment

by:aleghart
ID: 26217305
Might also check if your wireless router has UPNP enabled (I always disable it because AOL user was constantly trashing everything).  I understand that the technology is enabled so that a user who knows nothing about firewalls can get his/her daily filesharing fix...but seems reckless.
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Author Comment

by:tallguy2682
ID: 26274918
I have tried your suggestion. I shut down everything that used the router, and started the computer. It still did not start with a lan connection. Also the router does have UPNP enabled. Any other suggestions? I am really lost here. I have never seen anything like this before where it refuses to auto connect.
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Assisted Solution

by:aleghart
aleghart earned 80 total points
ID: 26280518
Could be either firmware or driver issue.  

1. Roll back driver one or two versions.
2. Try un-installing and re-installing manually with the OEM driver CD.
3. check OEM tech support for firmware update.  Even if there isn't a new version, try re-loading the current.
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Author Comment

by:tallguy2682
ID: 26289542
I am pretty sure i have tried everything with the drivers / router firmware. I have the most updated firmware and it was updated before i even posted here. I have reloaded the driver software that came with the motherboard, and have reloaded it from the motherboard. I came here to look for more outside the box answers, because of the extensive amount of troubleshooting I have already done. I think I may have resolved it by resetting some services from admin tools/services. I am not sure though. I will see how it works for the next few days and try to give out an exact service name if that is what it was so that future people looking for the solution can fix it also.
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Accepted Solution

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tallguy2682 earned 0 total points
ID: 26343638
I have an update. All was well with the computer automatically configuring the lan connection on startup after I started some processes. I cannot remember which they were, but they had to do with ethernet automatic something....but now the issue has returned. The computer worked fine for about a week. it had been fixed. Then i had to remove the power plug from the back of the computer to check what ports I had open to go and purchase a new video card. I unplugged the power cord, turned on the computer to fully discharge it, and checked what ports I had available. I then plugged in the cord and turned on the computer. The lan was back to its "media disconnected" status and i had to disable the ethernet adapter and re enable it for it to get an ip on the network. weird...
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