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Re: [Int-area] Comment on draft-ietf-intarea-frag-fragile-02

Jen Linkova <furry13@gmail.com> Mon, 12 November 2018 00:02 UTC

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From: Jen Linkova <furry13@gmail.com>
Date: Mon, 12 Nov 2018 11:02:43 +1100
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To: Joe Touch <touch@strayalpha.com>
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Subject: Re: [Int-area] Comment on draft-ietf-intarea-frag-fragile-02
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On Fri, Nov 9, 2018 at 2:32 AM Joe Touch <touch@strayalpha.com> wrote:
> > (https://tools.ietf.org/html/draft-ietf-intarea-frag-fragile-02#section-7.4)
> >
> > recommends that operators do not filter ICMPv6 PTB. I believe it would
> > be beneficial to make an explicit recommendation to permit fragmented
> > packets to/from operator's DNS servers.
>
> Fragment forwarding is a MUST in our standards.

I believe you are talking about routers supporting forwarding
fragmented packets, not about policy decisions. While the
recommendations in the draft (not to filter ICMP PTB messages) are
about policies.
So just another policy-related recommendation makes sense, IMHO.

> This document is BCP and cannot update a standard. It cannot relax that requirement, so the middlebox needs to be updated accordingly.

If we already have a document which is saying 'operators MUST NOT
filter any fragmented packets' then
it would be nice to reference it in the draft.

> *Additionally*, it’s bad practice to indicate “SHOULD” unless the text also explains why it isn’t a MUST, i.e., under what conditions it is OK to not forward fragments.

Sorry, I'm a bit confused. Which standard would need to be updated if
the proposed recommendation is made?

-- 
SY, Jen Linkova aka Furry

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