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Re: [v6ops] Fwd: New Version Notification for draft-collink-v6ops-ent64pd-01.txt

Gert Doering <gert@space.net> Wed, 21 December 2022 07:48 UTC

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Date: Wed, 21 Dec 2022 08:48:18 +0100
From: Gert Doering <gert@space.net>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>
Cc: Mark Smith <markzzzsmith@gmail.com>, Vasilenko Eduard <vasilenko.eduard=40huawei.com@dmarc.ietf.org>, V6 Ops List <v6ops@ietf.org>, Lorenzo Colitti <lorenzo=40google.com@dmarc.ietf.org>, xiaom@google.com, draft-collink-v6ops-ent64pd@ietf.org
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Subject: Re: [v6ops] Fwd: New Version Notification for draft-collink-v6ops-ent64pd-01.txt
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Hi,

On Wed, Dec 21, 2022 at 08:50:10AM +1300, Brian E Carpenter wrote:
> There's a reason that
> https://www.rfc-editor.org/rfc/rfc7421.html#section-4.5 suggests
> /80 as the reasonable limit for privacy purposes. The issue is
> making it highly unlikely (and therefore prohibitively expensive)
> to find an IID by a scanning attack. At /96, the search space is
> about 4 billion. Given the number of Internet users in the world,
> and possible applicability of the birthday paradox, that isn't a
> safe value. (I can't expect to find *your* IID, but I can hope to
> find *somebody's* IID.) At /80, the search space is about 281
> trillion.

What would the benefit be of finding someone's IID, if that IID is only
valid for a specific prefix?

But still, using a /80 permits 65000 host-prefix assignment out of a /64,
which sounds like "big enough" for a layer 2 segment with general purpose
machines attached to it  (for a "sensor network mesh" it might be a bit
tight, but hopefully these would not be requesting prefix delegations
and/or not be in a flat topology).

Gert Doering
        -- NetMaster
-- 
have you enabled IPv6 on something today...?

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