pesky network connectivity on Dell PowerEdge 1850

From: Orville Canter (ocanter_at_richp.com)
Date: 10/04/05

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    Date: Tue, 4 Oct 2005 12:21:40 -0700 (PDT)
To: debian-user@lists.debian.org

    Hello,

    I am running Debian 3.1 (Linux kernel 2.4.27-2-686-smp) on a Dell
    PowerEdge 1850 with two Xeon processors and two onboard Intel PRO/1000
    network interfaces. I am experiencing a very pesky problem wherein I
    periodically lose connectivity to network services on that host.

    Currently I am just serving SSH and HTTP, and sometimes, after half an
    hour or so, I am suddenly unable to GET a document over HTTP or connect by
    SSH. Sometimes services are unavailable for only a minute, and sometimes
    five minutes, and sometimes several hours. There is nothing in the logs
    indicating that the NIC went down and back up during this time, and
    sometimes the interface is pingable (though not always). Sometimes I can
    connect from one host but not another (but not always). It doesn't appear
    to be trying to renegotiate the speed and duplex--at least there are no
    up/down messages in /var/log/messages.

    I have tried several different network cables, both onboard NIC's, and two
    different switches. I recompiled the driver from Intel's source
    (http://downloadfinder.intel.com/scripts-df-external/confirm.aspx?ftpDown=ftp://aiedownload.intel.com/df-support/9180/eng/e1000-6.1.16.tar.gz&agr=N&ProductID=983&DwnldId=9180&strOSs=All&OSFullName=All%20Operating%20Systems&lang=eng)
    I am testing from two computers: a Solaris computer attached to the same
    switch and a remote FreeBSD machine connecting via the internet.

    I am running this
    kernel:

    Linux rescomp3 2.4.27-2-686-smp #1 SMP Mon May 16 16:55:31 JST 2005 i686 GNU/Linux

    I installed it from this package:

    kernel-image-2.4.27-2-686-smp

    Which I downloaded from via apt-get from:

    deb http://mirrors.kernel.org/debian/ stable main

    Syn cookies are enabled in the kernel but not in use:

    % cat /proc/sys/net/ipv4/tcp_syncookies
    0

    Any ideas or suggestions would be much appreciated.

    Thanks,
    Orville

    "I'm not exactly a hostage to traditional journalistic ethics, but I
    didn't understand how something made up could be 'just as true' [as
    something that is true]".

    Phil Greenspun, "The Book Behind the Book"
    http://philip.greenspun.com/wtr/dead-trees/story 

    -- 
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