Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard

Lorenzo Colitti <lorenzo@google.com> Thu, 23 February 2017 00:42 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 23 Feb 2017 09:41:43 +0900
Message-ID: <CAKD1Yr1W+AVt4Dixo9epB5VazxBsVMD+mrshwaE=n7SuX6eGDw@mail.gmail.com>
Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
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On Thu, Feb 23, 2017 at 5:20 AM, Brian E Carpenter <
brian.e.carpenter@gmail.com>; wrote:

> Nobody is saying that /64 isn't extremely widely used where it's
> appropriate to have a portable fixed length IID. Set the default
> at 64 and trust operators to change it where they need to.
> That's realistic.


As a host developer I strongly oppose that. It will make life easier for
network operators but make life harder for host OS developers, host
operators, and host users.

And it is absolutely inappropriate to change this now in given that the /64
boundary has been the standard for the last 20 years. It will break
deployed code that relies on the current standard. (That includes concrete
code I can point to that I know runs on tens of millions of devices.)
That's not acceptable to do in a standard reclassification.