pesky network connectivity on Dell PowerEdge 1850
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
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
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:
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
Any ideas or suggestions would be much appreciated.
"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"