On "Sat 11 of September 2004" Darren Kirby wrote: > Are MAC addresses unique for all ethernet cards? What I would like to > know is could I use this rule to allow ssh connections ONLY from my > notebook no matter what its current IP address happens to be, and drop > all other connection requests? Yes. MAC addresses are set in the card by the manufacturer. This is a good method to control input traffic. For more info: http://www.webopedia.com/TERM/M/MAC_address.html