[MBowser]

I've spent countless hours trying to resolve the following problem.

After about 20-30 minutes of bandwidth usage I always disconnect suddenly. It stops my downloads, kicks me out of gaming servers, and halts streaming video.

The connection quickly re-establishes itself moments later, with no notification that it ever disconnected.

I've done all of the obvious recommended steps:

-I've updated the firmware on EVERYTHING. Modem, Router, COMM Ports, you name it.

-Disabled Firewalls to see if I still have a problem.

-System Restored.

-I've played around with nearly every setting possible in any menu. (I.e. the modem/router device manager advanced options, and the router's main page)

-I've run virus scans and spyware scans so brutally that they come up with nothing now.

-I've tried different Ethernet Cables.

-I've disabled TCP/IP Offloading

-I've lowered my MTU

-I've made sure that no dubious software was installed.

Some things I've done to try and diagnose the problem:

I ran "ping www.google.com -t" in the command prompt for a while and watched it one of the times I disconnected. It returns a Request Timeout.

I've run programs like Wireshark and Colasoft Capsa:

-Wireshark returns "Destination Unreachable (Port Unreachable)" Whenever the problem occurs and rarely, a "Malformed Packet" error.

-Colasoft Capsa constantly spams "Port Unreachable" and Checksum Errors.

I have a Linksys WRT54GL Router, With a Arris TM502G Modem, running comcast high speed cable.

What in god's name could be the problem? And what can I do short of buying new hardware or reformatting?

Please Help .

 

[lorjack]

Hook up directly to the modem and see if you have the same problem.

 

[MBowser]

Thank you for the quick response.

Just checked, and yes, I do.

 

[lorjack]

Did you reinstall the NIC drivers, when you did your troubleshooting?

I've run virus scans and spyware scans so brutally that they come up with nothing now.

I'm a little troubled by that statement. What was it that the scans were finding?
This is in XP right?

Windows XP
Open up a command prompt (Start > Run > CMD)
Type the bolded commands in the command prompt window:

Reset TCP/IP Stack: netsh int ip reset reset.log
Reset WINSOCK entries: netsh winsock reset catalog

When finished reboot

 

[MBowser]

Did you reinstall the NIC drivers, when you did your troubleshooting?

Yes.

I'm a little troubled by that statement. What was it that the scans were finding?
This is in XP right?

Just a few moderate level threats. The comment was made because 90% of all computers seem to have spyware, not because I had a significant problem; Yes, I do have XP.

Windows XP
Open up a command prompt (Start > Run > CMD)
Type the bolded commands in the command prompt window:

Reset TCP/IP Stack: netsh int ip reset reset.log
Reset WINSOCK entries: netsh winsock reset catalog

When finished reboot

I Reset the winsock entries, but I couldn't find out how to reset the TCP/IP Stack.

The command prompt wouldnt let me type it all in at once, I had to type netsh, enter, winsock, enter, reset catalog

After following the same steps for the stack, I get to reset and it says "The Syntax supplied for this command is not valid."

I tried reset resetlog.txt, reset reset.log, reset resetlog.txt, reset reset.txt

It says "Examples: reset resetlog.txt"

Update: I went here http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q299357#FixItForMe and used the program to reset the stack.

Still no change in my connection.

 

[lorjack]

Yes.



Just a few moderate level threats. The comment was made because 90% of all computers seem to have spyware, not because I had a significant problem; Yes, I do have XP.



I Reset the winsock entries, but I couldn't find out how to reset the TCP/IP Stack.

The command prompt wouldnt let me type it all in at once, I had to type netsh, enter, winsock, enter, reset catalog

Well there is something screwy going on there, typing it in one word at a time should be giving you errors. I want you to try this and see if it finds anything. You will most likely need your XP CD.

http://www.updatexp.com/scannow-sfc.html

Ok back to the networking problem. Boot into safe mode with networking and see if you still get disconnected. Does this happen with another computer?