I have a comment - section 5 ("IPv6 Minimum Path MTU Hop-by-Hop Option") sets
aside two 16-bit fields to record MTU values. This places an upper bound limit of
(2**16 - 1) octets on the MTU that can be recorded at each hop, but this will be
too small for IP parcels which can grow to (64 * (2**16 -1)) octets. And, if support
for true jumbos may be needed in the future the fields should probably permit sizes
up to (2**32 -1) octets which would require 32-bit fields.
Fred
> -----Original Message-----
> From: ipv6 [mailto:ipv6-bounces@xxxxxxxx] On Behalf Of The IESG
> Sent: Thursday, January 27, 2022 4:38 PM
> To: IETF-Announce <ietf-announce@xxxxxxxx>
> Cc: draft-ietf-6man-mtu-option@xxxxxxxx; ipv6@xxxxxxxx; 6man-chairs@xxxxxxxx
> Subject: Last Call: <draft-ietf-6man-mtu-option-12.txt> (IPv6 Minimum Path MTU Hop-by-Hop Option) to Experimental RFC
>
> EXT email: be mindful of links/attachments.
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>
>
> The IESG has received a request from the IPv6 Maintenance WG (6man) to
> consider the following document: - 'IPv6 Minimum Path MTU Hop-by-Hop Option'
> <draft-ietf-6man-mtu-option-12.txt> as Experimental RFC
>
> The IESG plans to make a decision in the next few weeks, and solicits final
> comments on this action. Please send substantive comments to the
> last-call@xxxxxxxx mailing lists by 2022-02-10. Exceptionally, comments may
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> Abstract
>
>
> This document specifies a new IPv6 Hop-by-Hop option that is used to
> record the minimum Path MTU along the forward path between a source
> host to a destination host. The recorded value can then be
> communicated back to the source using the return Path MTU field in
> the option.
>
>
>
>
> The file can be obtained via
> https://datatracker.ietf.org/doc/draft-ietf-6man-mtu-option/
>
>
> The following IPR Declarations may be related to this I-D:
>
> https://datatracker.ietf.org/ipr/4567/
>
>
>
>
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