How to Change IP or MAC Address in Linux

Change IP Address:

1. Enter "Terminal":
   Here we use Ubuntu 9.04
   Click Applications >Terminal
   
   
2. Type: "sudo ifconfig eth0 xxx.xxx.xxx.xxx" to set your IP Address:
   Here we use 1.2.3.4 to show the effect, please note, you need the password of the administrator.
   
3. Type "ifconfig" and press Enter, you will see the IP has been changed:

Change Mac Address:

1. Launch Terminal and type in "ifconfig" to get your current Mac address:
    
2. Type in: "sudo ifconfig eth0 down" , and press Enter to temporary disable network:
    
   
3. Type in "sudo ifconfig eth0 hw ether xx:xx:x:xx:xx:xx" to set the Mac address you want, for example here we use "00:01:23:fe:c6:34" , so we type in: "sudo ifconfig eth0 hw ether 00:01:23:fe:c6:34" :
   
4. Then, type in "sudo ifconfig eth0 up" to restart your network:
   
5. Type in "ifconfig" again, to show your current Mac address: