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Re: Prefix Delegation and hosts

Lorenzo Colitti <lorenzo@google.com> Thu, 20 July 2017 11:45 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 20 Jul 2017 13:45:36 +0200
Message-ID: <CAKD1Yr39pYtw7A7z8Zixzvdky3v7Cy7f1fLfXi2+cKBP3aX1Lg@mail.gmail.com>
Subject: Re: Prefix Delegation and hosts
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: "Templin, Fred L" <Fred.L.Templin@boeing.com>, "ipv6@ietf.org" <ipv6@ietf.org>
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On Thu, Jul 20, 2017 at 4:37 AM, Brian E Carpenter <
brian.e.carpenter@gmail.com> wrote:

> If it gets a /64 and
> and chooses to use DHCPv6-PD to hand out /80s to its friends, nobody
> upstream will know (or care). Of course, SLAAC won't work for the friends,
> but nobody upstream will know that either. (It should be a small matter
> of coding to make SLAAC work with 48 bit IIDs, so I've no doubt that
> will show up in running code sometime.)


Why pick /80 instead of something more familiar such as /120? The
requesting router can even assign prefixes based on RFC1918 IPv4 /24
prefixes and IIDs based on the late 8 bits of the IPv4 address. Skip a few
steps in the race to the bottom.

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