That RFC describes motivations for /64 that are mostly superseded. I still think we need to wean ourselves of the quasi-stateful address notion, in IPv6, at least for the remaining majority of the address space. Bert -----Original Message----- From: ipv6 [mailto:ipv6-bounces@xxxxxxxx] On Behalf Of otroan@xxxxxxxxxxxxx Sent: Thursday, February 16, 2017 03:24 To: Randy Bush <randy@xxxxxxx> Cc: 6man WG <ipv6@xxxxxxxx>; IETF-Discussion Discussion <ietf@xxxxxxxx>; 6man-chairs@xxxxxxxx; draft-ietf-6man-rfc4291bis@xxxxxxxx Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard Dear Randy, >> If your statement is that we only have the 64 bit boundary because of >> SLAAC I believe you are wrong. > > cite, please. what else actually needs it? https://tools.ietf.org/html/rfc7421 Best regards, Ole