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Re: [v6ops] draft-ietf-6man-rfc4291bis prohibiting non-/64 subnets

Mikael Abrahamsson <swmike@swm.pp.se> Fri, 24 February 2017 13:13 UTC

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Date: Fri, 24 Feb 2017 14:13:13 +0100
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: IPv6 Operations <v6ops@ietf.org>
Subject: Re: [v6ops] draft-ietf-6man-rfc4291bis prohibiting non-/64 subnets
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On Fri, 24 Feb 2017, Pierre Pfister wrote:

> At least Linux, Windows, Apple, Cisco, and probably all mature IPv6 
> stacks, would let you configure prefixes of length different than 64.

I just came back from PTO not reading IETF email for 5-6 weeks, and read 
up on this thread.

I just want to state my opinion that whatever text we come up with should 
reflect current operational reality, in that SLAAC A=1 only works on /64, 
and that people use all kinds of subnet sizes when manually configuring 
interfaces.

If current code doesn't treat 000::/3 in any special case, then documents 
should reflect this.

Mandating /64 only for any IPv6 use case doesn't reflect reality as I see 
it. I don't want to see A=1 /64 SLAAC requirement relaxed either.

I just want the -bis document to reflect what is currently in the field 
and we know works. Nothing more, nothing less.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se

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