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Re: [Tsv-art] [v6ops] [Last-Call] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05

Nick Hilliard <nick@foobar.org> Mon, 22 February 2021 15:27 UTC

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To: Tom Herbert <tom@herbertland.com>
Cc: Fernando Gont <fgont@si6networks.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>, Gorry Fairhurst <gorry@erg.abdn.ac.uk>, tsv-art@ietf.org, last-call@ietf.org, draft-ietf-v6ops-ipv6-ehs-packet-drops.all@ietf.org, IPv6 Operations <v6ops@ietf.org>
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From: Nick Hilliard <nick@foobar.org>
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Date: Mon, 22 Feb 2021 15:23:04 +0000
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Subject: Re: [Tsv-art] [v6ops] [Last-Call] Tsvart last call review of draft-ietf-v6ops-ipv6-ehs-packet-drops-05
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Tom,

We're talking at cross-purposes here. This is a descriptive 
Informational draft.  Its aim is to describe a specific problem set 
relating to an ipv6 protocol component.

Tom Herbert wrote on 22/02/2021 14:55:
> Yes, different routers do different things, but can you quantify what
> the most commonly deployed routers do? If we can do that then we could
> establish a better requirement for host stacks more than just "don't
> send IPv6 header chains that are too long".

... which proposes to turn the draft into a prescriptive draft, i.e. to 
advise on what protocol implementers should do.

We totally get the value proposition of what you're suggesting, but it 
doesn't belong in this draft.  Establishing workable limits is both 
difficult and subjective, which is why our proposal is that it should be 
in a future draft which would probably end up being a BCP.

Nick

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