topic network lost once in a while in Operating System - Linux

network lost once in a while

Jean-Yves Picard — Thu, 09 Aug 2007 03:57:18 GMT

Hello,

short story
after a few day I lost network connectivity ..

longer story
I turn a EVO to a workstation by installing redhat 4 (kernel 2.6.9-55).
this worked fine for a while. Starting some month ago I loose network connectivity at a random.

there is no messages in (/var/log) messages apaprt from ntp complaint about unreachable server.

when pigging host I lost at least 50% packet.

network folks swear nothing has change on our network, there is no error on my port and that I must 'fix it on hosts'.

my network card is a internal broadcom BCM5751 Gigabit adapter.
I use tg3 network driver.

have anyone seen a similar problem ?

Jean-Yves

Re: network lost once in a while

Steven E. Protter — Thu, 09 Aug 2007 04:13:29 GMT

Shalom,

Over the years I have received similar problems:

1) Check and replace network cabling.
2) Run hardware diags on the broadcom adapter and replace if anything is wrong.
3) See that the network switch port is good, if possible use a different one.
4) Take tcpdump or wireshark information as a diagnostic step.

SEP

Re: network lost once in a while

AwadheshPandey — Thu, 09 Aug 2007 06:44:20 GMT

Also check the routes entry, once I faced the same problem.....

Re: network lost once in a while

Jean-Yves Picard — Thu, 09 Aug 2007 07:30:24 GMT

Hello,

I think I have come to a solution, I remove iptables stuff (pretty hard to do, no least than 6 level of dependencies).

I still can't understand why it worked for so long before comming to an halt nowadays ....

Jean-Yves

Re: network lost once in a while

Steven E. Protter — Thu, 09 Aug 2007 07:48:29 GMT

The problem may recur.

vi /etc/sysconfig/iptables

Edit that so after next boot the problem does not return.

Or stop running iptables, you are in a corporate lan, why again do you need a firewall?

chkconfig iptables off

Regards,

Shmuel