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

Sander Steffann <sander@steffann.nl> Mon, 20 February 2017 15:01 UTC

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From: Sander Steffann <sander@steffann.nl>
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Subject: Re: Last Call: <draft-ietf-6man-rfc4291bis-07.txt> (IP Version 6 Addressing Architecture) to Internet Standard
Date: Mon, 20 Feb 2017 16:01:39 +0100
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To: Alexandre Petrescu <alexandre.petrescu@gmail.com>
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Hi,

> Which brings back the question of why /64.

I think after this many years the answer is "because". If IPv6 had been designed from the start with /96 LANs then that would have been the standard. But today /64 is the standard, a clear standard size makes working with IPv6 easier, and we have enough addresses to actually do this. So is /64 the only technical choice that would work? No. Is it a choice made in the past that we should stick to (with well-informed exceptions where appropriate): Yes. It has advantages beyond pure technical necessity that make it useful.

But there MUST be room for people to use use something else than a /64. While it's good to have a default size that works well, forcing /64 though people's throat when they know what they are doing and need something else must remain possible. (this is both me speaking as an IPv6 teacher and as a network engineer :)

Cheers,
Sander