ethernet problem

[Fadia Almarei]

Dear All
i have Redhat Enterprise Linux AS v.4 ,run on Dell server , i have two network cards , i configutre the first ethernet card and give it a static IP, i see something strange , whenever i restart the network service the ethernet become inactive and i need to activate it again ,what is the cause for this.
BR,
Fadia

[RAC_1]

Any duplicate ips on the network??
What does messages log file say??

[Fadia Almarei]

no duplicate

[RAC_1]

How do you activate it?? Are there any error/informational messages in /var/adm/messages file??

[Rick Garland]

You state a static IP for the 1st eth, how is the 2nd eth configured? Any chance the config is overlapping to both eth cards?

[Rick Garland]

A thought that just occurred;

Are both cards configured with unique names and their respective scripts have no overlap?

Look in the /etc/sysconfig/networking directory and the /etc/sysconfig/network-scripts directory. Any misstated info in these scripts?

[Huc_1 · Accepted solution]

In the file /etc/sysconfig/network-scripts/ifcfg-eth0 you should see a line like

ONBOOT=yes

Jean-Pierre Huc

[Steven E. Protter]

I've noticed some anamolous behavior with Red Hat 4.

I lock down the network configuration, fixed both or three cards. Then, after a few days of undetermined use a new file appears in /etc/sysconfig/network-scripts starting with a : and looking like one of those configuration files.

Networking is okay until restarted, then the external interface doesn't work properly. Remove the strange little file and restart the network and all is well.

I was suspecting some kind of buffer overflow creating a file except the whole directory is chattr +i on my system since its exposed to the Internet.

I suggest a look around in /etc/sysconfig/network-scripts for files that simply do not belong.

SEP

[Gopi Sekar]

Check /etc/sysconfig/network it should have NETWORKING=yes

Hope this helps,
Gopi

[Alexander Chuzhoy]

I'd check first Huc's suggestion.
Unless you have ONBOOT=yes in
/etc/sysconfig/network-scripts/eth0
the interface won't become active upon start/restart of network service.
Regards.

[Fadia Almarei]

thanks gues the problem solved , the ONBOOT was no ,so i change it and every thing is OK