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Re: L=0 [was draft-pioxfolks-6man-pio-exclusive-bit-02.txt]

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 01 February 2018 08:56 UTC

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Date: Thu, 01 Feb 2018 09:56:30 +0100
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Lorenzo Colitti <lorenzo@google.com>
cc: Ole Troan <otroan@employees.org>, 6man WG <ipv6@ietf.org>
Subject: Re: L=0 [was draft-pioxfolks-6man-pio-exclusive-bit-02.txt]
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On Wed, 31 Jan 2018, Lorenzo Colitti wrote:

>> Not if the network implements SAVI.
>
> But if it does, that allows the hosts to mount a state exhaustion attack on
> the network by creating new IP addresses. Remember, one of the biggest
> advantages of the prefix-per-host model is that it has none of the
> scalability issues inherent in individually tracking IP addresses.

SAVI-style functionality can enforce prefix-per-host in a (semi) shared 
L2. That's what it does.

Remember, SAVI supports DHCPv6-PD in a shared medium as well, there is no 
either/or here.

> Sure. Now write down how it will scale without limiting the number of IP 
> addresses that each host can use.

You have drawn the wrong conclusions about what SAVI is. The "A" in SAVI 
can mean /64, /56 or whatever. It doesn't need to be on a per-address 
basis.

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

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