On Sunday 10 February 2002 10:42, Will Lotto wrote: > To take a mac address, one needs to wait for a PC to go offline (or > take a PC offline), then steal the MAC. ... Stealing the MAC is very > easy, intel network cards let you SET the MAC in windows (under > advanced settings) ... in linux, there are programs that can do it, > which work with most cards. Yes.... and for Linux, the software is..... IFCONFIG :-( Just type "ifconfig eth0 hw ether 11:22:33:44:55:66", and it's done. Too simple :-( > > As for protection, I don't believe there is a simple way to > protect against such an attack ... Encryption? :) I've done it. I'm using WEP. But I'm not sure if WEP are secure enough :-( I heard, it is possible to break WEP. So, I block connection using MAC address also. But now..... it's again very easy to break :-( Ok, thank you for all reply.... I will learn more about autentification, L2TP and IPSec. Regards, Adi Nugroho