[CentOS] Kernel 2.6.18-53.1.13.el5 fails on network.

[nate]

Indunil Jayasooriya wrote:

> I also got this type of probles once before. pls check initrd image.
> pls performe below steps.
>
While it's always good to make sure your initrd is in a good state,
the network drivers don't need to be in the initrd (unless your booting
from NFS or something). They can be loaded fine from /lib/modules/`uname -r`

What kind of network chip(s) are in the system? What driver are they
using?(/etc/modprobe.conf), it'd be helpful to have the output of
dmesg as well from the kernel that doesn't provide networking support.

You could write a script for some person at the remote co-lo to execute
when the system comes up w/o network, the results could be stored in
a file on the disk and when the system is rebooted again under the
old kernel you can examine them for possible causes.

Some commands to try:
dmesg
ifconfig -a
mii-tool
route -n
ping -c 5 (IP of default gateway)
arping -c 5 (IP of default gateway)
arp -an
lsmod

nate