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Internet sharing slowed to nothing with no clear reason...

Last response: in Networking
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July 26, 2010 12:39:47 AM

I'm fairly frustrated by this problem and would greatly appreciate your help. :cry: 

Alright, so here's the situation:

My computer (computer 1) is connected by LAN (cat5) to another computer (computer 2). Computer 2 is connected to a wireless router by a wireless card. Computer 1 does not have a wireless card. Both computers are running Windows 7.

This worked wonderfully until sometime this afternoon. Without me changing anything related to the network, my internet connection slowed to about 2-4 kbps and hasn't recovered since then. All 4 of the other computers in the house connect at the same speed as usual, so the problem is only related to my computer.

What I've tried:

Rebooting the router.

Windows 7's troubleshooter for network problems.

From an elevated command line:
ipconfig /release
ipconfig /renew
ipconfig /flushdns

Did a system restore to a day ago (when it worked perfectly)
Set my BIOS to optimized defaults.

Updated the networking driver.

None of these have had any impact.

My LAN is part of my GIGABYTE motherboard.

Here is my system info: http://dl.dropbox.com/u/570881/Valzi_SIW.html

Thanks! Anxiously awaiting your replies!
July 26, 2010 1:11:19 AM

Two more pieces of information:

1. I just tried a PCI LAN card and have the same issue.

2. Windows Network Diagnostics reports that "Troubleshooting was unable to automatically fix" this problem: "Local Area Connection" doesn't have a valid IP configuration.
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July 26, 2010 2:20:42 AM

One more thing: I just plugged my ethernet cord directly into the router/modem and internet works! In my mind, this narrows the problem down quite a lot.

I've tried connecting this computer (Computer 1) to 3 other computers to receive internet. All three of those receive their internet wirelessly. Therefore, there's a problem with the settings on this computer, but the hardware is fine.

Any idea what I need to change?
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July 26, 2010 3:08:54 AM

So I fixed it, but it's still a mystery.

This configuration works:

Internet --> Wireless Router ))) Computer 2 --> LAN switch --> Computer 1

--> represents wired connection and ))) represents wireless connection.

My original working configuration that no longer works:

Internet --> Wireless Router ))) Computer 2 --> Computer 1

Why on earth did it stop working? I wasn't changing anything at the time that I can remember, certainly nothing network-related. Anyway, it's working now, so I'm not too worried about, but I'd still like to know what happened.

Anyone have any thoughts?
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August 5, 2010 3:16:18 AM

I keep getting emails from Tom's Hardware asking me to select the best answer, but no one answered the post other than me. It won't let me select my own reply. What should I do?
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August 12, 2010 12:01:37 AM

valzi said:
I keep getting emails from Tom's Hardware asking me to select the best answer, but no one answered the post other than me. It won't let me select my own reply. What should I do?


Bump.
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Best solution

August 12, 2010 1:19:21 PM

It sounds like your computer was piggybacked onto another computer. The other computer will take priority over your computer with using the internet.
Other factors come into play as well. The wireless card can only handle so much. From maintaining its connection with the wireless router and then trying to communicate with your computer. The weak link is the wireless card in the first computer.

When you connected the switch you took the load off the wireless card in computer1. Now the wireless is back to maintaining computer 1's signal and your computer is transmitting and working over the wired connection.

If possible, you would ideally want to run a cable from your wireless router to your computer or to that switch. This could possibly bump your connection speed up higher by bypassing computer1 completely and giving your computer direct access to the router and internet access.
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August 19, 2010 12:04:38 AM

Best answer selected by valzi.
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