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Re: New Version Notification for draft-hinden-6man-hbh-processing-01.txt

Fernando Gont <fernando.gont@edgeuno.com> Fri, 11 June 2021 05:21 UTC

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From: Fernando Gont <fernando.gont@edgeuno.com>
To: "pthubert=40cisco.com@dmarc.ietf.org" <pthubert=40cisco.com@dmarc.ietf.org>
CC: "brian.e.carpenter@gmail.com" <brian.e.carpenter@gmail.com>, "gorry@erg.abdn.ac.uk" <gorry@erg.abdn.ac.uk>, "bob.hinden@gmail.com" <bob.hinden@gmail.com>, "ipv6@ietf.org" <ipv6@ietf.org>, "tom@herbertland.com" <tom@herbertland.com>
Subject: Re: New Version Notification for draft-hinden-6man-hbh-processing-01.txt
Thread-Topic: New Version Notification for draft-hinden-6man-hbh-processing-01.txt
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Date: Fri, 11 Jun 2021 05:21:03 +0000
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Hi, Pascal,

On Fri, 2021-06-11 at 05:00 +0000, Pascal Thubert (pthubert) wrote:
> This might need a solution be similar to the MTU problem; e.g.,
> during PMTUD a node might add the HbH Options that it needs to check
> that the options make it through…

Aside from a bunch of other evil details:

WHat if, say, you employ this solution at, say, connection-
establishment time, find that EHs actually "work" towards your
destination, but them, sometime later, the path to your
destinationchanges, and you find out that EHs no longer work?

     Abort the transaction/connections? 
     "Migrate" from EH-based mechansim to the fall back mechanism?
     Anything else?

What about the impact on e.g. RTT for connection-establishment? What
about the complexity of the mechanism? How many bugs/vulns before every
implementation gets it right?

Truth #3 of https://datatracker.ietf.org/doc/html/rfc1925 comes to
mind...

Thanks!

Regards,
-- 
Fernando Gont
Director of Information Security
EdgeUno, Inc.
PGP Fingerprint: DFBD 63E3 B248 AE79 C598 AF23 EBAE DA03 0644 1531

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