> I want to know how IP unnumbered works ? And, is there any RFC or > other document on > this subject ? I have only seen ip unnumbered on cisco routers and only for the serial interfaces. You assign the thernet interface an ip and then configure ip unnumbered on the serial such that it uses that same ip. Kind of convenient when you have one ip address but your termination on one end is serial and on the other end it is ethernet. Noah. - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org