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Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 30 April 2019 20:48 UTC

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Subject: Re: Confirmation to advance: draft-ietf-6man-ipv6only-flag-05
To: Tim Chown <Tim.Chown@jisc.ac.uk>, Sander Steffann <sander@steffann.nl>
Cc: 6man WG <ipv6@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Date: Wed, 01 May 2019 08:48:23 +1200
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On 01-May-19 00:47, Tim Chown wrote:
>> On 30 Apr 2019, at 12:17, Sander Steffann <sander@steffann.nl> wrote:
>>
>> Hello Brian
>>
>>> FWIW I agree that Nick has been arguing consistently. The authors got that he doesn't like the idea :)
>>
>> And Nick is not alone. I consider this draft to be harmful and oppose it's fundamental idea. There is no rule that bad drafts can't be opposed because we can't suggest text to "fix" our objections.
>>
>> You asked for something actionable: withdraw it. Its cost far outweigh its benefits.
> 
> I'm quite neutral on this flag option, but is this something that could soon be progressed via draft-troan-6man-universal-ra-option rather than adding it to the IANA IPv6 ND RA registry?  I don't see mention of this in the ipv6only-flag draft.

No, but to be honest it's a secondary question. If the idea is fundamentally bad, encoding it as a universal RA option rather than a single bit doesn't really change anything.

So I'd rather understand *why* the costs outweigh the benefits. One more thing for an operator to configure and check in each first-hop router, vs reduction of pointless traffic on updated hosts. I'm not sure how to make that an objective rather than a subjective trade-off.

    Brian

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