Re: A 3rd try at a proposal for draft-ietf-6man-rfc4291bis-07
David Farmer <farmer@umn.edu> Tue, 07 March 2017 04:56 UTC
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From: David Farmer <farmer@umn.edu>
Date: Mon, 06 Mar 2017 22:56:20 -0600
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Subject: Re: A 3rd try at a proposal for draft-ietf-6man-rfc4291bis-07
To: Lorenzo Colitti <lorenzo@google.com>
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On Mon, Mar 6, 2017 at 9:18 PM, Lorenzo Colitti <lorenzo@google.com> wrote: > On Tue, Mar 7, 2017 at 4:05 AM, David Farmer <farmer@umn.edu> wrote: >> >> Instead, I would suggest another approach: see what the problems with >>> 4291 are, *write them down*, and only then write a document explaining what >>> should be changed and why. >>> >> >> The list of 7 points are the problems that many see with 4291bis, maybe >> overly summarized, but they are there. >> > > Well, but what you provided is an alternative solution, not a problem > statement. Example of a problem statement would be, "RFC 4291 does not > allow non-64-bit IID lengths. However, assigning smaller prefix lengths is > necessary because [...]". > To be clear no where in the text I provided does it say that an IID other than 64 is allow. It say 128 bit quantities from manual configuration and DHCPv6 can be associated with with subnet prefixes of any length. That is a fine distinction, but no finer that you claiming that requiring that 64-bit IIDs, and you implying 64-bit subnet prefixes too, doesn't make IPv6 classful. Are you saying that every implementation of IPv6 that allows manual config of subnet prefixes other that /64 have it wrong? Furthermore, if subnet prefixes other than /64 aren't allowed then how do we have RFC6164 I contend that the whole concept of an IID is optional, please note that RFC4291 and it's predecessor say: "At a minimum, a node may consider that unicast addresses (including its own) have no internal structure", So I contend that RFC4291 merely says that if you use an IID it must be 64 bits. It doesn't directly say that 128bit IPv6 addresses can't be associated with subnet prefixes other than /64. In fact it also says, "IPv6 unicast addresses are aggregatable with prefixes of arbitrary bit-length, similar to IPv4 addresses under Classless Inter-Domain Routing." Which to me implies that subnets other than /64 have to be valid. Furthermore, RAs are allowed to be any length, especially if they don't set the "A" flag, why is this if not to allow subnet prefixes of any length? > I can't help fill in the [...] because I personally don't see what you can > do with a /113 that you can't do with a /64 (other than conserve addresses, > which has always been a non-goal), but there seem to be several > participants who do see a problem. What I'm saying is that if we want to > change the standard, the people who see a problem with it should articulate > that problem in a way that it's possible to find a solution using informed > and documented engineering trade-offs rather than opinions. > Just because you can't see it doesn't mean that other can't and don't have valid uses. I'm not convince it's actually making any change, SLAAC still has 64-bit IIDs. It is only making explicit that, manual config and DHCPv6 address can be associated with subnets of any length, and it's clear that at least some implementors think it says that already, and I think your in the minority of people that think's it doesn't. Thanks. -- =============================================== David Farmer Email:farmer@umn.edu Networking & Telecommunication Services Office of Information Technology University of Minnesota 2218 University Ave SE Phone: 612-626-0815 <(612)%20626-0815> Minneapolis, MN 55414-3029 Cell: 612-812-9952 <(612)%20812-9952> ===============================================
- A 3rd try at a proposal for draft-ietf-6man-rfc42… David Farmer
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Lorenzo Colitti
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Job Snijders
- Re: A 3rd try at a proposal for draft-ietf-6man-r… David Farmer
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Brian E Carpenter
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Alexandre Petrescu
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Lorenzo Colitti
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Fred Baker
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Lorenzo Colitti
- Re: A 3rd try at a proposal for draft-ietf-6man-r… David Farmer
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Lorenzo Colitti
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Lorenzo Colitti
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Alexandre Petrescu
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Mark Smith
- Re: A 3rd try at a proposal for draft-ietf-6man-r… David Farmer
- Re: A 3rd try at a proposal for draft-ietf-6man-r… Mark Smith