> IPv4 provides no mechanism whatever for addresses greater than 32 bits. > Therefore, mathematically, there is no possible design for an IP with > bigger addresses that is transparently backwards compatible. We've known > that since at least 1992. i guess you forget the discussion of variable length. i hope we don't have to rehash it here. decisions were made. some were quite bad. v6 had some real zingers. remember tla/nla? no feature parity, such as dhcp (a war which has not finished)? it is almost as if it was designed to fail. randy _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf