mac address in ubuntu

to add to the file /etc/network/interfaces
\r
in the section where you specify the settings of the network card option hwaddress
auto eth0
iface eth0 inet dhcp
hwaddress ether 01:02:03:04:05:06

TO puzzled.
MAC flashed to the card itself, i.e., its change is possible only in the context of specific settings, a working OS. Statement of the problem "forever change" is incorrect.
The maximum that can be changed on the OS level to indicate that it needs for the interface use a different MAC. And here "the script in the startup" is no worse than any other way.

two options:
\r
1)in NetworkManager in the properties for the wired interface in the column mac address
2)in the /etc/network/interfaces to have the interface to set the option hwaddress
for examples see man interfaces.
\r
auto eth1
iface eth1 inet static
address 192.168.1.200
netmask 255.255.255.0
hwaddress 11:22:33:44:55:66

Using hwaddress in /etc/network/interfaces, you cannot change the Mac address of the card. This option is there for.

I'm not good at ubuntu. But something tells me that in /etc/udev/rules.d/ there is a file persistent-net.rules
Him and rule.

In Ubuntu 10.10, the Network Manager settings wired interface bar appear "Cloned MAC address", to set there the new MAC address of the network interface.
Try.

Wow, Ubuntu began to be equipped with its own MAC address? :)