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Re: Giving up security & privacy when manually configuring addresses - rfc4291bis text (Re: draft-bourbaki-6man-classless-ipv6-00)

Lorenzo Colitti <lorenzo@google.com> Thu, 08 June 2017 11:42 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Thu, 08 Jun 2017 20:41:49 +0900
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Subject: Re: Giving up security & privacy when manually configuring addresses - rfc4291bis text (Re: draft-bourbaki-6man-classless-ipv6-00)
To: Fernando Gont <fgont@si6networks.com>
Cc: Mark Smith <markzzzsmith@gmail.com>, Job Snijders <job@instituut.net>, Erik Kline <ek@google.com>, 6man WG <ipv6@ietf.org>
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On Wed, Jun 7, 2017 at 9:03 PM, Fernando Gont <fgont@si6networks.com> wrote:

> Measurements indicate that when folks do manual configuration, they do
> "low-byte" addresses -- i.e., no matter the prefix length, they just set
> the IID to all zeroes except for the last byte or so. -- having "easy to
> remember" addresses seems to be the goal in that case.
>

I don't think you have measurements that prove this. You almost certainly
can make a statement that there are a number of low-entropy addresses where
the top bytes are all zeros, and that those are *likely* statically
configured. I don't think you can prove that the high-entropy addresses
with lots of nonzero bits are NOT manually configured.

As for "last byte" - using the last 32 bits of the address to store the
IPv4 address seems pretty common too. Akamai has published data about this,
I believe.

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