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

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 20 December 2022 19:50 UTC

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Date: Wed, 21 Dec 2022 08:50:10 +1300
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To: Mark Smith <markzzzsmith@gmail.com>, Vasilenko Eduard <vasilenko.eduard=40huawei.com@dmarc.ietf.org>
Cc: 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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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [v6ops] Fwd: New Version Notification for draft-collink-v6ops-ent64pd-01.txt
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On 20-Dec-22 23:07, Mark Smith wrote:

> Have you considered the privacy address implications of only having 32 bits to work with instead of 64?

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.

Regards
    Brian Carpenter

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