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RE: Prefix Delegation and hosts

"Templin, Fred L" <Fred.L.Templin@boeing.com> Thu, 20 July 2017 12:06 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Lorenzo Colitti <lorenzo@google.com>, Brian E Carpenter <brian.e.carpenter@gmail.com>
CC: "ipv6@ietf.org" <ipv6@ietf.org>
Subject: RE: Prefix Delegation and hosts
Thread-Topic: Prefix Delegation and hosts
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Date: Thu, 20 Jul 2017 12:06:09 +0000
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From: Lorenzo Colitti [mailto:lorenzo@google.com]
Sent: Thursday, July 20, 2017 4:46 AM
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Templin, Fred L <Fred.L.Templin@boeing.com>; ipv6@ietf.org
Subject: Re: Prefix Delegation and hosts

On Thu, Jul 20, 2017 at 4:37 AM, Brian E Carpenter <brian.e.carpenter@gmail.com<mailto: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.


Ø    Or, just jump to /128 immediately and do NAT?

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