Step 1: check your Mac address.
sudo inconfig
and then, you will see the following lines in your terminal:
eth0 Link encap:Ethernet HWaddr 00:16:41:e5:7f:1d
inet addr:192.168.1.50 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::216:41ff:fee5:7f1d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:92 errors:0 dropped:0 overruns:0 frame:0
TX packets:92 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:14966 (14.9 KB) TX bytes:11325 (11.3 KB)
Memory:ee000000-ee020000
lo Link encap:Local Loopback
...
In this case, your mac address is 00:16:41:e5:7f:1d.
Step 2: Set the Mac address as you wish.
sudo ifconfig eth0 hw ether 00:00:00:00:01:01
Of course, you can use other mac address you want here. Then, enter your password. Afterwards, check the Mac address again, you will see the following in your terminal:
chen@chen-IBM-UBUNTU:~$ ifconfig
eth0 Link encap:Ethernet HWaddr 00:00:00:00:01:01
inet addr:192.168.1.50 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::216:41ff:fee5:7f1d/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:4150 errors:0 dropped:0 overruns:0 frame:0
TX packets:3660 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:4323076 (4.3 MB) TX bytes:758494 (758.4 KB)
Memory:ee000000-ee020000
lo Link encap:Local Loopback
To reset/restore your Mac address, you can restart your machine and login again.
DONE.
