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Thread: [SOLVED] Bad problem with network, posibly a virus or worse

  1. #1
    Join Date
    Oct 2007
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    Question [SOLVED] Bad problem with network, posibly a virus or worse

    Hi
    Today my internet stopped working, when i open the system monitor it shows that is sending at a speed of 190 KB/s but I only have a 2MB connection and its only capable of sending 55 KB/s, so I boot into windows and find my internet working ok.
    what could it be and how can I fix it?
    I did a ping as instructed in the help page and I get results from 20% to 60%, and the cpu seems to be all over the place.
    if I disable the connection the speed drops to 0 as it should and the modem's lights stop blinking, but when I enable it it jumps at 200MB.
    Here is a picture of the monitor just if anyone sees something I don't.
    Attached Images Attached Images

  2. #2
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    Ubuntu 11.04 Natty Narwhal

    Re: Bad problem with network, posibly a virus or worse

    First off what distro/version are you running.

    Second, its very unlikely that you have a virus, considering that there are no known linux viruses in the wild.
    To see what process it is do a:

    lsof |grep -i tcp

    or you can watch the traffic with tcpdump.
    Last edited by iponeverything; October 12th, 2008 at 06:19 AM.

  3. #3
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    Re: Bad problem with network, posibly a virus or worse

    I'm using ubuntu 8.10 updated til yesterday, lsof |grep -i tcp only shows 1 process listening and a warning that the information may be incomplete, the tcpdump command did nothing.

  4. #4
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    Re: Bad problem with network, posibly a virus or worse

    Tell tcpdump to listen on a specific interface:

    sudo tcpdump -n -i eth0

    where "eth0" is your network interface.

    also run:

    sudo ps auxwww > /tmp/outfile
    sudo netstat -n >> /tmp/outfile
    sudo lsof >> /tmp/outfile

    and upload /tmp/outfile with your next post and I'll take a look at it.
    Last edited by iponeverything; October 12th, 2008 at 06:53 AM.

  5. #5
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    Re: Bad problem with network, posibly a virus or worse

    Have you by some chance recently run some p2p (torrent) software?
    There are no dumb questions, just dumb answers.

  6. #6
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    Re: Bad problem with network, posibly a virus or worse

    Quote Originally Posted by lswb View Post
    Have you by some chance recently run some p2p (torrent) software?
    This just came to mind with me as well.. It could be running in the background.

  7. #7
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    Re: Bad problem with network, posibly a virus or worse

    No just transmision the ubuntu install is recent and that would not explain the supernatural speed.

  8. #8
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    Re: Bad problem with network, posibly a virus or worse

    the screen cap does not show the interface. For all we know it could be the loopback. Without more information, all your going to get is pure speculation.

    do a "killall -v -9 transmision"
    Last edited by iponeverything; October 12th, 2008 at 07:24 AM.

  9. #9
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    Re: Bad problem with network, posibly a virus or worse

    what is a loopback?
    from what I understand its like a local network in the machine, but if that was the case it would not go to 0 KB when I disable the eth.

  10. #10
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    Re: Bad problem with network, posibly a virus or worse

    "killall -v -9 transmision" didn't find any process.

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