Assign permanent mac address to an interface

[carlopmart <carlopmart@gmail.com>]

Hi all,

 I have install an etch box that has three network interfaces. I am 
trying to use iftab file to rename these interfaces whithout a result. 
How can I change eth0, eth1 and so on under etch??

Many thanks.

--
CL Martinez
carlopmart {at} gmail {d0t} com