network failing

[Tonatiuh]

Red Hat Enterprise Linux 3

The network fails intermitently. What should I do to verify if it is a software (O.S.) failure or a hardware failure? (the server is in the other side of the world and, by now, there is nobody to help me to perform any physical test or action, all I can do is remotely by ssh or vnc).

[Ivan Ferreira]

The first thing you must check is the /var/log/messages file. What is the "network problem" that you menthion? Cannot acces to any host, cannot access to some host? cannot connect to services?

[Tonatiuh]

network problem is: server does not respond to ssh, vnc or ping request.

[Ivan Ferreira]

You must check the messages file, depending if you have any messages logged, you should follow an action. The lastest problems I have found with network connectivity was solved with the kernel options:

noapic apm=off

[Wouter Jagers]

First thing is to make sure whether or not the problem is located on your server. Can you still reach other devices at the same location (if you have access to any) ?

When the problem occurs, it could be useful to run the traceroute command (tracert in windows) instead of ping.

This way you can spot should your problem be somewhere along the way.. after all, the other side of the world is a long way ;-)

Cheers

[Tonatiuh]

The problem is focused on the server. This server is part of a Cluster of 3-nodes and all nodes are in the same (segment, LAN switch, etc.) network, and the other 2-nodes was still working where the problem wiht this server ocurred.

[Vitaly Karasik_1]

which cluster? RH Cluster Manager?

do you have iLO access?

[Tonatiuh]

Not O.S. Cluster. This is an Oracle Real Application Cluster system using Oracle Clusterwere.

[Vitaly Karasik_1]

Did you check /var/log/message, as Ivan suggested?

"dmesg" output?

"ifconfig" output?

[Tonatiuh]

Hi Vitaly,

The first thing I did was check the /var/log/messages. It does not shows anything that could help.