{{MessageBox|backgroundcolor = #faa|image =Warning.png|heading =WARNING|message = This is recommended only for advanced users, proceed with caution.}} = Step 1 = You can manually force the assignment from a network card to what device comes up as (eth0, eth1 ...), you by changing the udev rules. You can manually edit this file:

This file maps MAC address to device name. Example:

# PCI device 0x10de:0x03ef (forcedeth) (custom name provided by external tool) '''Example'''<small> SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:1d:60:b5:43:66", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0" # PCI device 0x1186:0x4300 (r8169) SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="5c:d9:98:af:21:43", ATTR{dev_id}=="0x0", ATTR{type}=="1", KERNEL=="et1"</small>

If you want to reverse the assignementsassignments, switch eth0 and eth1 at the end of the linesentries. Or delete one of the entries. = Step 2 = You may need to also edit this configuration file as well:  /etc/sysconfig/network-scripts/ifcfg-eth0 if it has the MAC address for the device in it (e.g. in a variable called HWADDR). '''Example'''  HWADDR=00:1d:60:b5:43:66 You will need to adjust the HWADDR to match the MAC address of the card you wish to make eth0. Note: if you wish to keep eth1 active, you may also have to edit ifcfg-ith1 as well. These changes will only take effect after a reboot or a restart of the network services.

'''Please exercise care. Improperly modifying this file these files may render your system without network or even not boot properly.'''