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Old 10-08-2013, 03:17 PM   #1
randir14
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High ping caused by one computer on the network

I was wondering if anyone had an idea what could be causing a problem I'm having. Beginning about a week ago I have been noticing weird ping spikes (like 50-500) in online games. At first I thought it was a router problem so I tried plugging my PC's ethernet cable directly into the modem. That brought speeds back to normal.

However I decided to do more testing and discovered the lag is being caused by one computer on my network, because when I unplugged its wireless USB adapter the ping spikes stopped. I checked to see if any programs like uTorrent were running on that PC, but there was nothing. I thought it might be a virus constantly transmitting, but I ran Ad-Aware Antivirus 10.5 and AVG Free and neither of them found anything.

I've also monitored the logs in my router and didn't find anything suspicious. Anyone have a guess as to what the issue could be? The weird thing is websites load quickly and I have full speed when downloading, the only problem is high ping in games.
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Old 10-08-2013, 03:26 PM   #2
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Originally Posted by randir14 View Post
I was wondering if anyone had an idea what could be causing a problem I'm having. Beginning about a week ago I have been noticing weird ping spikes (like 50-500) in online games. At first I thought it was a router problem so I tried plugging my PC's ethernet cable directly into the modem. That brought speeds back to normal.

However I decided to do more testing and discovered the lag is being caused by one computer on my network, because when I unplugged its wireless USB adapter the ping spikes stopped. I checked to see if any programs like uTorrent were running on that PC, but there was nothing. I thought it might be a virus constantly transmitting, but I ran Ad-Aware Antivirus 10.5 and AVG Free and neither of them found anything.

I've also monitored the logs in my router and didn't find anything suspicious. Anyone have a guess as to what the issue could be? The weird thing is websites load quickly and I have full speed when downloading, the only problem is high ping in games.
When I was in 29 one the guys had who ran torrents for movies, music, porn, etc would crash the entire network when he logged on (even with his torrents shut "off"). Did that PC ever run torrents?
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Old 10-08-2013, 03:34 PM   #3
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Yeah it has been used to download torrents, but during these ping spikes I went to check the computer and utorrent wasn't running. In fact nobody was even using the PC.

I forgot to mention another thing, sometimes a message on there will pop up saying something like "Windows has detected an IP conflict, another device on this network has the same IP". But when I check my router every connected device has its own unique IP.
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Old 10-08-2013, 03:37 PM   #4
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Quote:
Originally Posted by randir14 View Post
I was wondering if anyone had an idea what could be causing a problem I'm having. Beginning about a week ago I have been noticing weird ping spikes (like 50-500) in online games. At first I thought it was a router problem so I tried plugging my PC's ethernet cable directly into the modem. That brought speeds back to normal.

However I decided to do more testing and discovered the lag is being caused by one computer on my network, because when I unplugged its wireless USB adapter the ping spikes stopped. I checked to see if any programs like uTorrent were running on that PC, but there was nothing. I thought it might be a virus constantly transmitting, but I ran Ad-Aware Antivirus 10.5 and AVG Free and neither of them found anything.

I've also monitored the logs in my router and didn't find anything suspicious. Anyone have a guess as to what the issue could be? The weird thing is websites load quickly and I have full speed when downloading, the only problem is high ping in games.
It's likely that those virus tools wouldn't have definitions for certain bot network malware/other programs doing things you don't want over the network that aren't technically viruses. Something that's chatting over the line was probably installed by a family member (you know, program installers that try to trick you into installing other crap if your aren't very watchful/cautious about it).

Most operating systems have tools you can run at least at the command promp/terminal to monitor connections. If you can print info about the connection as it's happening, knowing the destination address and doing some Google'ing will probably reveal the culprit.

You could always back up what you need and reinstall Windows, or better yet, switch to Linux Mint. /evangelism
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Old 10-08-2013, 03:41 PM   #5
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Here is a decent reference on netstat: on the iPad, forgive me if there are better ones, finger is tired. :-P

http://m.wikihow.com/See-Active-Netw...tions-(Windows)

There are probably very nice free tools that will log this kind of info, in case the connections are very short and you can't catch it in the command prompt.
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Old 10-08-2013, 03:44 PM   #6
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Thanks for the info, I'm probably going to try to convince them to reinstall Windows. I cleaned their PC awhile ago but I'm sure there is some hidden crap still lurking around in it.
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Old 10-08-2013, 03:45 PM   #7
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I forgot to mention another thing, sometimes a message on there will pop up saying something like "Windows has detected an IP conflict, another device on this network has the same IP". But when I check my router every connected device has its own unique IP.

Maybe try to set up DHCP reservations so each pc/device has it's set IP address?
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Old 10-08-2013, 03:50 PM   #8
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Maybe try to set up DHCP reservations so each pc/device has it's set IP address?
I have manually edited all the DHCP stuff so I don't know how or why it's telling me about an IP conflict

Oh and I also just noticed my Nexus 7 loads pages nearly instantly when the other PC is disconnected, so I guess it's not just high pings in games after all.
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Old 10-08-2013, 04:03 PM   #9
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Bad wifi dongle perhaps? Do you have the wifi usb adapter plugged into the pc and not a usb hub?
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Old 10-08-2013, 04:11 PM   #10
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I would guess there's either malware active that isn't being detected, or that you unintentionally installed some program that is using up a lot of traffic for some reason (by glitch or by design)

For instance, my bitcoin wallet is on my laptop, but I don't use that computer much anymore, so whenever I boot that computer up, a huge amount of ram is used as it tries to sync the wallet. I would guess something like that is up, but with IP traffic.
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Old 10-08-2013, 04:28 PM   #11
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Bad wifi dongle perhaps? Do you have the wifi usb adapter plugged into the pc and not a usb hub?
It's plugged into the PC. Maybe you're right about the wifi adapter going bad, if I reinstall Windows and the problem still persists then it seems my only option will be to buy a new one.
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Old 10-08-2013, 04:33 PM   #12
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It's plugged into the PC. Maybe you're right about the wifi adapter going bad, if I reinstall Windows and the problem still persists then it seems my only option will be to buy a new one.
You could also try moving the adapter to another port and see if it still happens. Try one in the back or front depending on where it was originally. I know I have issues with some usb peripherals when using the front usb ports on my case. When I switch to the back ones connected to the motherboard I do not have issues.
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Old 10-08-2013, 04:34 PM   #13
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If possible - you could try connecting the pc via Ethernet cable to your network. If the problem persists you know it's the pc else it's the USB wireless dongle.
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Old 10-08-2013, 04:36 PM   #14
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If possible - you could try connecting the pc via Ethernet cable to your network. If the problem persists you know it's the pc else it's the USB wireless dongle.
Good call.
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Old 10-08-2013, 06:30 PM   #15
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Just finished hooking the problem computer into the router with an ethernet cable and the problem wasn't fixed. Now I am sure it's infected with something.
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Old 10-08-2013, 06:37 PM   #16
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Just finished hooking the problem computer into the router with an ethernet cable and the problem wasn't fixed. Now I am sure it's infected with something.
Did you try Malwarebytes Anti-Malware/Combofix/Rkill/Tdsskiller? Link

Try those 4 programs if you want to avoid a wipe and see what happens.
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Old 10-08-2013, 06:55 PM   #17
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Also if you feel intimately familiar with your computer
Hijackthis
It has the possibility of really, really, really messing up your computer though. (Wonderful tool otherwise)
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Old 10-08-2013, 07:45 PM   #18
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Norton Power Eraser - Stand alone app designed for cleaning up malware. You may need to run it a couple times to make sure everything gets removed.
http://security.symantec.com/nbrt/npe.aspx
https://support.norton.com/sp/en/us/...ail_2014_en_us


Also Malware removal guide:
http://us.norton.com/support/premium...oval_guide.pdf
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Old 10-08-2013, 08:18 PM   #19
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Just finished hooking the problem computer into the router with an ethernet cable and the problem wasn't fixed. Now I am sure it's infected with something.
I assume you have done the same bypassing the router entirely solely connecting the computer to a modem? I don't know how proficient you are in this area but I recommend using Wireshark or another IP scanner/traffic logger and look at whats going on when you get these spikes.
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Old 10-08-2013, 08:37 PM   #20
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A lot of times when you experience high traffic on a local network it is due to a loop. Make sure no cables are plugged unto the same devices. Ravijn's link is perfect. Combofix is amazing!

Also, take a look at the link Akuma posted (netstat). If you know how to properly use netstat it can take you far.
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