Posted by: kezhong | February 27, 2011

Persistent the network interface numbering

One of our servers always changed its ethX numbers after being rebooted. For example, this time it’s eth0, next time it will be eth1, and it happened randomly.
After searched from the net, I found the solution, and record as below.

Firstly, find out the MAC addresses of the NICs.
# grep -H . /sys/class/net/*/address|grep -v lo

Then, modify the MAC addresses in the file /etc/udev/rules.d/70-persistent-net.rules to change Udev rules similar to the following:
# vi /etc/udev/rules.d/70-persistent-net.rules
SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”, ATTR{address}==”00:0c:29:32:b9:eb”, ATTR{type}==”1″, KERNEL==”eth*”, NAME=”eth0″
SUBSYSTEM==”net”, ACTION==”add”, DRIVERS==”?*”, ATTR{address}==”00:0c:29:31:b8:ec”, ATTR{type}==”1″, KERNEL==”eth*”, NAME=”eth1″

Reboot the system again and again, I found that the network interface numbering was persistented.


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