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Re: Éric Vyncke's No Objection on draft-ietf-6man-icmp-limits-07: (with COMMENT)

"Eric Vyncke (evyncke)" <evyncke@cisco.com> Sat, 07 March 2020 09:44 UTC

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From: "Eric Vyncke (evyncke)" <evyncke@cisco.com>
To: Tom Herbert <tom@quantonium.net>
CC: The IESG <iesg@ietf.org>, "draft-ietf-6man-icmp-limits@ietf.org" <draft-ietf-6man-icmp-limits@ietf.org>, "6man-chairs@ietf.org" <6man-chairs@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>, Bob Hinden <bob.hinden@gmail.com>
Subject: Re: Éric Vyncke's No Objection on draft-ietf-6man-icmp-limits-07: (with COMMENT)
Thread-Topic: Éric Vyncke's No Objection on draft-ietf-6man-icmp-limits-07: (with COMMENT)
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Date: Sat, 07 Mar 2020 09:44:27 +0000
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Hello Tom

Thank you for the quick reply.

See below for EV> (and I have removed most of the text when we agree)

Regards

-éric

-----Original Message-----
From: Tom Herbert <tom@quantonium.net>
Date: Friday, 6 March 2020 at 22:58
To: Eric Vyncke <evyncke@cisco.com>
Cc: The IESG <iesg@ietf.org>, "draft-ietf-6man-icmp-limits@ietf.org" <draft-ietf-6man-icmp-limits@ietf.org>, "6man-chairs@ietf.org" <6man-chairs@ietf.org>, "ipv6@ietf.org" <ipv6@ietf.org>, Bob Hinden <bob.hinden@gmail.com>
Subject: Re: Éric Vyncke's No Objection on draft-ietf-6man-icmp-limits-07: (with COMMENT)

    On Fri, Mar 6, 2020 at 3:57 AM Éric Vyncke via Datatracker
    <noreply@ietf.org> wrote:
    >
    >
    > -- Section 2.2 --
    > Why not using a new code for 'unrecognized header' by intermediate node ? I
    > really wonder why: it can only be confusing to existing implementation.
    >
    I imagine the host response would be the same.

EV> may be
    
    > Please also ensure what is meant by 'destination' here... I would prefer to
    > avoid discussions when a routing-header is used (too many discussions around
    > this in 6MAN already)
    >
    Will make that "final destination"
    
EV> yes, please :)


    > -- Section 2.4 --
    > How can the original source distinguish among the two potential causes ? Why
    > not using two code points? Or am I missing something obvious? I was really
    > about to issue a blocking DISCUSS on this one.
    >
    If the Pointer points to the first byte of an extension header then
    the limit on extension headers is inferred. If it points to something
    inside extension headers then the length is exceeded. Grant it, that's
    not 100% accurate but I don't believe that fine granularity is needed
    for host response.

EV> indeed, the source cannot distinguished among the two causes when the length is exceeded at the start of a new EH. Honestly, why not using two different code points? (Non blocking comment)

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