## On RHEL-based systems

If your interface is `eth0`, edit `/etc/sysconfig/network-scripts/ifcfg-eth0`. If you see a `HWADDR` param, comment it out and add `MACADDR=xx:xx:xx:xx:xx:xx`. Here's a sample:

```bash
DEVICE=eth0  
BOOTPROTO=dhcp  
#HWADDR=00:12:79:A0:59:DE  
MACADDR=00:12:79:A0:59:F4  
ONBOOT=yes  
  
# On CentOS 6  
BOOTPROTO="dhcp"
```

Then restart the network service for this to take effect:

    service network restart

## On BSD-based systems

If your interface is `igb0`, add a file called `/etc/start_if.igb0` to specify the cloned MAC:

    ifconfig igb0 ether 00:12:79:45:89:df

Then reboot your server.