Re: [Gen-art] Review of draft-ietf-6man-rfc1981bis-04
Brian E Carpenter <brian.e.carpenter@gmail.com> Wed, 15 February 2017 21:26 UTC
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Subject: Re: [Gen-art] Review of draft-ietf-6man-rfc1981bis-04
To: Joe Touch <touch@isi.edu>, Stewart Bryant <stewart.bryant@gmail.com>, Stewart Bryant <stewart@g3ysx.org.uk>, gen-art@ietf.org
References: <148665359396.20513.9749548375095869760.idtracker@ietfa.amsl.com> <2997d33f-3884-7831-50ed-1713c93b3867@gmail.com> <b9dfd941-0eba-c257-fef4-2f5e6bbd82a8@gmail.com> <9a1a0a47-d8fd-5cf9-0244-7ce624d58470@gmail.com> <aa18ed73-97e4-ac66-8667-8367d71bb03d@isi.edu>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <cdc76c31-933a-c17f-7efd-08d399768159@gmail.com>
Date: Thu, 16 Feb 2017 10:26:50 +1300
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On 16/02/2017 10:12, Joe Touch wrote: > Brian (et al.), > > > On 2/10/2017 11:45 AM, Brian E Carpenter wrote: >>> practice the >>> Internet breaks the mechanism. However it breaks it is a way that seems >>> disruptive to some user traffic. The document is really guidance >>> one how hosts might use ICMP for optimization, and arguable need >>> not be a standard at all. >> I think that's a mischaracterisation of the mechanism (and the draft). >> PMTUD is not an optimisation. Without it, you get black holes > PMTUD is an optimization to avoid fragmentation. > > Without it, you use fragmentation (which has overheads and other > consequences, notably for IPv4). In IPv6, you don't even know you *need* fragmentation without PMTUD, since only the source is allowed to fragment. (That was one of the many failure modes for 6to4, which is why the only safe approach was to use 1280 always.) > However, it is only *with* PMTUD (and ICMP blocking) that you get black > holes. True for v4. Brian
- Review of draft-ietf-6man-rfc1981bis-04 Stewart Bryant
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Brian E Carpenter
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Brian E Carpenter
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… C. M. Heard
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Suresh Krishnan
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… C. M. Heard
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… otroan
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Mark Andrews
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Eggert, Lars
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… otroan
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Fred Baker
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… otroan
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- RE: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Templin, Fred L
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… james woodyatt
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Joe Touch
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Joe Touch
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Brian E Carpenter
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Joe Touch
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Joe Touch
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Brian E Carpenter
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Joe Touch
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Joe Touch
- Re: Review of draft-ietf-6man-rfc1981bis-04 Bob Hinden
- Re: [Gen-art] Review of draft-ietf-6man-rfc1981bi… Stewart Bryant