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RE: New Version Notification for draft-herbert-6man-icmp-limits-01.txt

Ron Bonica <rbonica@juniper.net> Mon, 22 May 2017 18:47 UTC

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From: Ron Bonica <rbonica@juniper.net>
To: Tom Herbert <tom@herbertland.com>
CC: Mark Smith <markzzzsmith@gmail.com>, "6man@ietf.org" <6man@ietf.org>
Subject: RE: New Version Notification for draft-herbert-6man-icmp-limits-01.txt
Thread-Topic: New Version Notification for draft-herbert-6man-icmp-limits-01.txt
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Date: Mon, 22 May 2017 18:47:49 +0000
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Hi Tom,

This raises the salient question. When the source IP stack receives a message informing it that HTL has been exceeded, what should it do?

When the source IP stack receives an ICMP PTB message, the required action is well-understood. It should:

- update its estimate of the PMTU associated with the destination of the original packet
- inform a higher layer protocol if appropriate
- refrain from sending messages that exceed the PMTU in the future

When the source IP stack receives a message informing it of a HTL violation, what should it do? 

                                                                    Ron


> I don't think HTL should qualify for that special status. The difference
> between PTB and HTL is the response the sending host(s) take. For PTB the
> response is deterministic, the sending application should lower its PMTU. But
> handling of HTL is not deterministic, it may or may not be feasible to reduce
> headers to fit. The response to HTL might be more on the administrative side
> like other destination unreachable errors.
>

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