[CentOS] Network issue after new kernel install

Michael D. Kralka michael.kralka at kvs.com
Thu Nov 1 18:33:42 UTC 2007

Paul Norton wrote:
> Michael D. Kralka wrote:
>> Paul Norton wrote:
>>> On all of my CentOS 5 VMWare ESX3 virtual machines (about 15), after
>>> installing a new kernel and rebooting the machine, the Network script
>>> tries to run dhclient and can't determine the IP info (since I don't run
>>> a dhcpd server... it's a static IP only lan).  This also backs up my
>>> ifcfg-eth0 file to ifcfg-eth0.bak and writes a new ifcfg-eth0 that has
>>> dhcpd with no IP info.  Copying the ifcfg-eth0.bak to ifcfg-eth0 and
>>> running /etc/init.d/network start or ifup eth0 brings my network back
>>> up.
>> I have found that kudzu does this if it detects changes in the MAC
>> addresses of your NICs. Did you clone/copy your virtual machine and did
>> VMware regenerate MAC addresses for your virtual NICs?
> Yes, these are all clones(From one base image).  Would I just copy the
> MAC address given from VMWARE to the ifcfg-eth0 file?

If you move ifcfg-eth0.bak to ifcfg-eth0 after the first reboot, kudzu
will not move it again (since all subsequent reboots will have the new
"cloned" MAC address).

I would probably just disable kudzu in the base image, unless you plan
on adding/removing hardware in the future.


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