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Re: I-D Action: draft-bourbaki-6man-classless-ipv6-06.txt

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 18 April 2022 22:26 UTC

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Subject: Re: I-D Action: draft-bourbaki-6man-classless-ipv6-06.txt
To: Mark Smith <markzzzsmith@gmail.com>, Randy Bush <randy@psg.com>
Cc: bourbaki@bogus.com, 6man <ipv6@ietf.org>
References: <165030713553.2600.8991173749687838810@ietfa.amsl.com> <178caafd-cb72-64aa-78e4-ba0cb7198c2d@gmail.com> <A4B7B1A1-159C-4E62-A2D2-C37454FA60C1@psg.com> <CAO42Z2x2E+a31VCcZWyN0XFtio4+KGdS_N34ZzMgrb3eogQaNA@mail.gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Message-ID: <1c5d5c0c-d348-59f6-42cb-126af86ac6b8@gmail.com>
Date: Tue, 19 Apr 2022 10:26:08 +1200
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On 19-Apr-22 10:03, Mark Smith wrote:
> "Lets make IPv6 easier for people learn and adopt by making its addressing as complex as IPv4's", said no one ever.
> 
> IPv6's addressing should be as simple as will do the job.

But it doesn't only have one job. draft-bourbaki- is about its job as a locator for routing purposes, and all it really says is what BCP198 (RFC7608) already says: the routing prefix is any length up to 128 bits, and longest-match routing always applies.

(That's why I have for a long time wanted RFC4291 to say that /64 is a parameter rather than an architectural constant.)

Most of the arguments seem to be about the bits *after* the routing prefix, where people want the address to do several different jobs.

    Brian

> 
> An example of how simple IPv6 addressing should aim to be is RFC760's IPv4 addressing format. As somebody who has taught IPv4 Classes, Subnet Masks and VLSM, and of course used all of them, RFC760 is my favourite version of IPv4.
> 
> There's a lot of people who seem to really like IPv4's footguns just because they're used to them.

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