On Thu, 2008-08-07 at 16:58 +0800, Sheng Jiang wrote: > I am with Ilji. A well-organized hierarchical system can easily guarantee > global > uniqueness. Every level can control it only assigns unique prefix to next > level > within its only prefix pool. Both FQHN and IP address are good examples, > which have > achieve global uniqueness. It is only difficult if we want to achieve global > uniqueness with pure flat structure, like current HIT. Now, the point is > whether > statistical uniqueness is enough. If the answer is no, change the structure.
IPv6 addresses are only guaranteed to be unique because if two host interfaces on the same link happen to share the same IID, then Neighbor Discovery breaks and the first-hop router cannot resolve who to send packets to. The exact same property holds for any 8+8 scheme. As long as hosts are allowed to autoconfigure the lower 8 bytes of their address field, then it is not possible to guarantee global uniqueness for that part of the address. The best that can be accomplished is to ensure that nothing breaks if two hosts in the Internet happen to share the same value for those 8 bytes. Regards, // Steve -- to unsubscribe send a message to [EMAIL PROTECTED] with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg
