Red Hat Linux Error — Bringing up interface eth0: Device eth0 has different MAC address than expected, ignoring.

I’m running Red Hat Linux Enterprise (RHEL) 4 on an IBM BladeServer HS20 blade. The machine was throwing a bunch of errors about the battery. After much diagnosis and the compulsory exercise of upgrading the firmware, IBM came out and replaced the system board.

After the replacement, the system booted up fine. But the network connection wouldn’t come up. I tried to bring it up.

These command should work on Fedora, CentOS, and other Red Hat-flavored distributions.  I believe that these commands are also similar on Debian distros like Ubuntu.  How about Solaris, HP-UX, or AIX?  Sorry, ifconfig works, but you need to look elsewhere for the rest of the commands.

Red Hat Linux Commands to Start Network Connection

Linux command to start the network connection:

RHEL4# /etc/init.d/network start
Bringing up interface eth0: Device eth0 has different MAC address than expected, ignoring. [FAILED]

Linux command to find the hardware/MAC address of eth0:

RHEL4# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:14:5E:AE:2D:B1

Update this line in ifcfg-eth0 (replace eth0 with your interface, of course):

RHEL4# grep HWADDR /etc/sysconfig/network-scripts/ifcfg-eth0
HWADDR=00:14:5E:AE:2D:B1

RHEL4# /etc/init.d/network start

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