Serious Network Glitch. Really need help.

Pinkeyes

Pinkeyes

Pinkeyes

Associate
Joined
30 May 2005
Posts
1,533
Location
Greater Manchester
OK. I posted a problem in General hardware suspecting this was my network card in my shuttle. I think it's worse than that.

Would really appreciate some help in trying to solve this.

I noticed since upgrading to a shuttle, I have been having a regular network glitch where the network keeps cutting out, and more annoyingly online games disconnect me. I'm not saying it is the shuttle, but could a faulty NIC cause this ?

The network basically dies every few minutes, and then comes back a few seconds later.

To try and solve this problem I did a series of "pings" and watched the results.

2 PCs, 1 ADSL Router (Vigor 2600 Plus) (also tried Linksys WAG354 with sam results)

From both PCs I set continuous pings going to:

My Router
My ISPs Gateway
My ISPs DNS
Each other.

After a few minutes, ALL pings stop for aroung 6 "Request timed outs" and then it returns. Sometimes it takes longer, but all will return sooner if I "repair" the LAN.

Also - occasionally, the pinging between the 2 PCs carries on.

I have tried 3 router, changed the Microfilter, and it still happens. Took my switch out of the equation.

I ran Ethereal (well Wireshark now) and it captured an "outage" but didn't show anything.

Any help in what I can try would be greatly appreciated.
 
As if to confuse matters even more. I seem to be able to force this to happen by connecting to Steam (to play online HL games) from the Shuttle.

Latency shoots up and pings fail beetween both PC and the router, but work between each other. 6 or so "Request time out" it goes back to normal. Lets me play for 20 mins and then times me out from the server with the same failed pings.

I just cannot understand what could be causing this.

Dodgey NIC in shuttle ??
 
If it happens when you start a specific app, I'd be more inclined to believe it's a software issue.

I'd suggest trying (for example) a Ubuntu live CD (since if you saw the same issue outside your particular Windows install, you'd know it was almost certainly a hardware issue), but once you've got that far, I'm not sure what you'd try for something that was like Steam :confused:
 
Its not a Marvell Yokon Gigabyte NIC is it? I had similar issues with my Onboard LAN port, I had to switch to my other Nvidia Onboard network port, for it to start working. I have seen a few people report problems with this NIC and XP.
 
This just gets weirder. Might even be an ISP issue :confused:

Just to rule out the Shuttles onboard NIC, I completely disabled it in the BIOS.
I then installed a Wireless USB NIC, and repeated the tests.

It still happens - all the pings die, except the internal one to each PC.

The pings to the internal side of the router stop, and external pings stop (including the external connection to the game server)

So it looks like a router issue, yet I have tried 3 different routers, all give the same problem. Also changed the cables, and the microfilter.

Could it be a DoS attack to my router ? would that effect the internal port of the router ?

I do have a few ports open on my router. One to an internal web server - but the visits to that page do not correspond at all to the timeouts.

I have reported this to my ISP - I am on MAXDsl 8 Meg. Although, I am pretty sure this happened before I had MASDsl.
 
I had a similar problem when I upgraded my shuttle. Long story short, faster processor and graphics card meant more heat inside the shuttle, especially when playing games and the motherboard temperature would go up to 80. Computer would continue to work but the NIC would fail at 78.
 
Tui said:
I had a similar problem when I upgraded my shuttle. Long story short, faster processor and graphics card meant more heat inside the shuttle, especially when playing games and the motherboard temperature would go up to 80. Computer would continue to work but the NIC would fail at 78.
Click to expand...

Thanks for the idea.

My CPU and Graphics card are pretty range (see sig). I also had removed the idea of the NIC by Using an External Wireless NIC.

I'm now wondering if it could be the Windows network as Tolien suggested.

I discovered when I clear my arp table with the command "Arp -d *" and ping the router again, it begins to work.

I will try an Ubuntu live CD next I think.

Any more suggestions would be welcomed though.
 
After spending the weekend trying to figure this out.

Found I had an application running on the internal network which was some sort of network sniffer. It had Arp Spoofing built into it, and it seemed to be causing the problem. Not lost one ping since then :cool:

*phew*
 
You must log in or register to reply here.
Back
Top Bottom