I solved this, sort of. There was another host on the switch that was
answering arp requests (and pings) for my host's ip address. I tracked it
down through the switch, but surprisingly, when I ran ifconfig -a on the
offending host, no interface was configured to use that ip address. Yet it
kept answering the arp requests with its own hardware address. I was
unable to find what was causing it to do this, but when I rebooted it, the
behavior stopped, and the intermittent connectivity problem went away.
Orville
On Tue, 4 Oct 2005, Orville Canter wrote:
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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