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Re: HBH Option Header Configuration (draft-hinden-6man-hbh-processing)

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 08 June 2021 20:49 UTC

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Subject: Re: HBH Option Header Configuration (draft-hinden-6man-hbh-processing)
To: Nick Hilliard <nick@foobar.org>, Bob Hinden <bob.hinden@gmail.com>
Cc: IPv6 List <ipv6@ietf.org>
References: <90F1C7DD-A8FF-45C1-9B9F-6E57A04AB88B@gmail.com> <bf5714f9-a580-eaa4-5f5e-c9198505f799@foobar.org>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <4ce55411-5e3b-ccf9-12b1-5652346fb60c@gmail.com>
Date: Wed, 09 Jun 2021 08:48:52 +1200
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On 09-Jun-21 08:18, Nick Hilliard wrote:
> Bob Hinden wrote on 08/06/2021 21:06:
>> We have discussed this and conclude that yes, we are proposing to
>> require all nodes to examine and process the first HBH Option in the
>> Fast Path.   Not just drop packets with HBH Option Headers.  This
>> change needs to be made clearer in the draft.
> [...]
>> Comments?
> 
> yep - it's 26 years too late to close this particular stable door.

I wouldn't say it exactly like that, but I think the requirement is
totally unrealistic. To be precise:

"However, it
is to be expected that high-performance routers will either ignore it
or assign packets containing it to a slow processing path.  Designers
planning to use a hop-by-hop option need to be aware of this likely
behaviour."

[https://www.rfc-editor.org/rfc/rfc7045.html#section-2.2]

(Standards wonk comment: Since RFC8200 does not obsolete or update
RFC7045, this draft would need to formally update RFC7045 for this
reason. Which I would object to...)

Regards
   Brian

> 
> Nick
> 
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