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I have an Intel SE7525RP2 motherboard with a Yukon Marvel (82541GB controller) NIC in it. After installing CentOS 5.1 it functions fine for some minutes then looses network connectivity. By coincidence, I was using the system to clean some HD's for another and had booted off Knoppix and noticed it never exhibited this behavior, the network remained functional even overnight when I returned to the system?

I looked through messages and didn't see anything NIC/network related, can anyone suggest something to check?

Thanks!
jlc
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  • Fajar Priyanto at Jan 4, 2008 at 4:56 am

    On Friday 04 January 2008 11:18:15 Joseph L. Casale wrote:
    I have an Intel SE7525RP2 motherboard with a Yukon Marvel (82541GB
    controller) NIC in it. After installing CentOS 5.1 it functions fine for
    some minutes then looses network connectivity. By coincidence, I was using
    the system to clean some HD's for another and had booted off Knoppix and
    noticed it never exhibited this behavior, the network remained functional
    even overnight when I returned to the system?

    I looked through messages and didn't see anything NIC/network related, can
    anyone suggest something to check?
    Hi Joseph,
    When the network drops, how do you wake it up again?
    That might lead us somewhere.
    --
    Fajar Priyanto | Reg'd Linux User #327841 | Linux tutorial
    http://linux2.arinet.org
    11:55:56 up 4:21, 2.6.22-14-generic GNU/Linux
    Let's use OpenOffice. http://www.openoffice.org
    The real challenge of teaching is getting your students motivated to learn.
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  • Joseph L. Casale at Jan 4, 2008 at 5:20 am

    Hi Joseph,
    When the network drops, how do you wake it up again?
    That might lead us somewhere.
    --
    Fajar Priyanto
    Given my limited Linux experience, I just reboot :)
    I know, not very helpful, sorry...
    jlc
  • John R Pierce at Jan 4, 2008 at 5:07 am

    Joseph L. Casale wrote:
    I have an Intel SE7525RP2 motherboard with a Yukon Marvel (82541GB
    controller) NIC in it. After installing CentOS 5.1 it functions fine
    for some minutes then looses network connectivity. By coincidence, I
    was using the system to clean some HD?s for another and had booted off
    Knoppix and noticed it never exhibited this behavior, the network
    remained functional even overnight when I returned to the system?

    I looked through messages and didn?t see anything NIC/network related,
    can anyone suggest something to check?

    if it literally drops in a few minutes, run wireshark and leave it
    capturing all traffic on the LAN interface until it craps. then stop the
    capture, and look at the last set of packets.
  • Joseph L. Casale at Jan 4, 2008 at 5:22 am

    if it literally drops in a few minutes, run wireshark and leave it
    capturing all traffic on the LAN interface until it craps. then stop the
    capture, and look at the last set of packets.
    John,
    I am sure I can stoke this up, but how do I analyze the traffic after? Its sitting idle when this happens, so I suspect there shouldn't be much anyway!
    jlc
  • John R Pierce at Jan 4, 2008 at 6:14 am

    Joseph L. Casale wrote:
    if it literally drops in a few minutes, run wireshark and leave it
    capturing all traffic on the LAN interface until it craps. then stop the
    capture, and look at the last set of packets.
    John,
    I am sure I can stoke this up, but how do I analyze the traffic after? Its sitting idle when this happens, so I suspect there shouldn't be much anyway!

    wireshark shows the packets symbolically, in a tree form, where you can
    open up and examine the fields of any packet, most all protocols are
    formatted nicely. the traffic the last couple seconds before it dies
    could be quite interesting, and may well help you solve this.

    you might capture the output of `ifconfig -a` both before and after it
    fails, and compare. is this using DHCP or static IP ?

    are there any events related to networking at the end of the `dmesg`
    output right after it bonks ?
  • Joseph L. Casale at Jan 4, 2008 at 6:41 am

    is this using DHCP or static IP ? DHCP
    are there any events related to networking at the end of the `dmesg`
    output right after it bonks ?
    Darn, never looked there (my bad). I will get it up again this weekend and attempt the wireshark dump and make sure I save the dmesg log.

    Thanks!
    jlc
  • William L. Maltby at Jan 4, 2008 at 5:21 pm

    On Thu, 2008-01-03 at 23:41 -0700, Joseph L. Casale wrote:
    is this using DHCP or static IP ? DHCP
    are there any events related to networking at the end of the `dmesg`
    output right after it bonks ?
    Darn, never looked there (my bad). I will get it up again this weekend and attempt the wireshark dump and make sure I save the dmesg log.
    JIC it is not apparent, dmesg after net drop. Remember that dmesg is
    always available, not just after boot. But saving an after boot one
    might be good too, here.
    Thanks!
    jlc
    <snip sig stuff>
    --
    Bill
  • Joseph L. Casale at Jan 5, 2008 at 4:40 pm
    The system turned out to have a flaky motherboard. It's not worth fixing so I think I am just going to punt it:)
    Thanks for all the info, it was insightful and will help me in the future!

    jlc
  • Johnny Hughes at Jan 4, 2008 at 12:35 pm

    Joseph L. Casale wrote:
    I have an Intel SE7525RP2 motherboard with a Yukon Marvel (82541GB controller) NIC in it. After installing CentOS 5.1 it functions fine for some minutes then looses network connectivity. By coincidence, I was using the system to clean some HD's for another and had booted off Knoppix and noticed it never exhibited this behavior, the network remained functional even overnight when I returned to the system?

    I looked through messages and didn't see anything NIC/network related, can anyone suggest something to check?

    Thanks!
    jlc
    Also it might help to do an modinfo of the actual module that is used to
    drive the NIC and see what the version is on both OSes.



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  • Kai Schaetzl at Jan 4, 2008 at 1:01 pm
    I'd do a simple ifconfig first. Networking can be restarted with "service
    network restart".

    Kai

    --
    Kai Sch?tzl, Berlin, Germany
    Get your web at Conactive Internet Services: http://www.conactive.com
  • Kenneth Porter at Jan 4, 2008 at 3:39 pm
    --On Friday, January 04, 2008 2:01 PM +0100 Kai Schaetzl
    wrote:
    I'd do a simple ifconfig first. Networking can be restarted with "service
    network restart".
    You can restart individual interfaces with "ifdown eth0" and "ifup eth0".
    (Substitute the appropriate interface name for "eth0".)

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