Just an idea: If there is an entire class of problems that can only be solved by a flag in the address itself, why not reserve the top 16 bits of the Interface Identifier? To put it another way, if having semantically significant bits in the address is the best solution for a problem or two now, we might well want more bits in the future. Also, if we are not going to support a full 64-bit identifier, 48-bits is the next logical break.
-John -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
