(WARNING: doing this will break all existing network connections!) You can test changes without restarting the system by executing: Upper and lower case letters are accepted when specifying the MAC address, because the network function converts all letters to upper case. This directive should not be used in conjunction with HWADDR." The MACADDR "directive is used to assign a MAC address to an interface, overriding the one assigned to the physical NIC. This directive should not be used in conjunction with MACADDR." The HWADDR "directive is useful for machines with multiple NICs to ensure that the interfaces are assigned the correct device names regardless of the configured load order for each NIC's module. Note: in the file is a value HWADDR - This is not the same thing. In Red Hat Enterprise Linux ( RHEL) and other similar systems ( Fedora, CentOS, etc.) an easy way to make changes "permanent" across reboots is to add an appropriate entry to the /etc/sysconfig/network-scripts/ifcfg-ethN file (ifcfg-eth0 for the first Ethernet interface config file, ifcfg-eth1 - for the second, etc.): In openSUSE and other SUSE-based systems ( SUSE enterprise desktop\server, etc.) you can make changes "permanent" across reboots by adding an appropriate entry to the /etc/sysconfig/network/ifcfg-ethN file (ifcfg-eth0 for the first Ethernet interface config file, ifcfg-eth1 - for the second, etc.): Making Changes Permanent - Surviving a Reboot
NOTE: You may not be able do this if using a DSL modem (depending on modem vendor or ISP). To confirm your setting, you may prefer to execute " ip link ls eth0" or " ip addr ls eth0" instead of " ifconfig eth0". etc/init.d/network stop ip link set eth0 address 02:01:02:03:04:08 /etc/init.d/network start If you have iproute2 utilities installed, you may prefer to use the " ip" command, as follows: CentOS and Scientific Linux), to disable and restart networking, one must stop and start /etc/init.d/network, instead of /etc/init.d/networking. Alternatively, under RHEL/ Fedora and possibly other GNU/Linux distributions (incl. The above should work on Debian, Ubuntu, and similar distributions. etc/init.d/networking stop ifconfig eth0 hw ether 02:01:02:03:04:08 /etc/init.d/networking start
prepended with "sudo "), in order for things to work! NOTE: Commands below MUST be executed with root privileges (e.g. Substitute according to your requirements. NOTE: MAC addresses used within this article are provided for example only. Under GNU/Linux, the MAC address of a network interface card (NIC) can be changed by following the procedures below.
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