直接指定client static Mac Address，這試用於有些爛卡，MAC Address不合規則
ref: http://www.debian-administration.org/articles/501
If you wish to explicitly set your MAC address upon a Debian system you can do so by adding an entry to your /etc/network/interfaces file.

Beneath each interface you wish to setup add "hwaddress ether xx:xxx..". For example:

auto eth0 static
iface eth0 inet static
address 1.2.3.4
gateway ...
broadcast ...
hwaddress ether 02:01:02:03:04:08