I have come to consider an individual address as a /128 prefix, which I have come to call a "fully-qualified prefix". I don't know about other prefix lengths between /64 and /128, however.
Fred [EMAIL PROTECTED] -----Original Message----- From: Mattias Webjörn Eriksson [mailto:[EMAIL PROTECTED] Sent: Sunday, August 13, 2006 3:35 PM To: [email protected] Subject: Prefix longer than /64 This might have been brought up and answered before, my appologies. It is possible to assign an address with a prefix longer than /64 to an interface, for instance 2001:16d8:ff97:4::1:2/112. But, rfc4291 section 2.5.4 Global Unicast Addresses, states: "All Global Unicast addresses other than those that start with binary 000 have a 64-bit interface ID field (i.e., n + m = 64), formatted as described in Section 2.5.1. Global Unicast addresses that start with binary 000 have no such constraint on the size or structure of the interface ID field." ...Which means that a prefix longer than /64 is not valid. rfc3627 suggests that one should use avoid using a prefix longer than /64, meaning that it is "somewhat not invalid". It seems to be some deployments with router link subnets with prefixes longer than /64. (http://www.huque.com/~shuque/doc/penn-ipv6-plan.html). Could someone enlighten me here, please? Best regards Mattias Webjorn Eriksson -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list [email protected] Administrative Requests: https://www1.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
