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

Fernando Gont <fgont@si6networks.com> Wed, 07 June 2017 12:33 UTC

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Subject: Re: Giving up security & privacy when manually configuring addresses - rfc4291bis text (Re: draft-bourbaki-6man-classless-ipv6-00)
To: Fred Baker <fredbaker.ietf@gmail.com>, Mark Smith <markzzzsmith@gmail.com>
Cc: Job Snijders <job@instituut.net>, Erik Kline <ek@google.com>, 6man WG <ipv6@ietf.org>
References: <CAO42Z2ziUZnK+n2f9N_Xvb5TZBppApXgNSmDsRLxaT1_taLvFw@mail.gmail.com> <EB4E2A17-B77F-40B8-B565-B3BBC1E378B3@gmail.com>
From: Fernando Gont <fgont@si6networks.com>
Message-ID: <b6f8abce-0e92-a376-4c17-0095ffa95d11@si6networks.com>
Date: Wed, 07 Jun 2017 15:07:06 +0300
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On 06/07/2017 06:37 AM, Fred Baker wrote:
> 
> On Jun 6, 2017, at 6:23 PM, Mark Smith <markzzzsmith@gmail.com> wrote:
>>
>> That doesn't mention that security and privacy properties of addresses
>> will be compromised if the manually configured addresses are from a
>> small prefix.
> 
> Or advertised in DNS?
> 
> I would expect that any address configured manually would also be advertised in DNS, the latter being the reason for the former. If the address is publicly announced, does one have a reasonable expectation of privacy?

Not for rivacy, I'd say. However, posting addresses in the DNS is not
necessarily an excuse for making the predictable.

If a company posts addresses on the DNS, but the addressses are not
predictable (they do not follow patterns), in the even that I want to
target "all of such organization's servers" IPv6 address scans is not an
option., so I'd have to resort to DNS bruteforcing, reverse-mapings dns
lookups, or some alternative technique.

OTOH, if the ORG employs predictable/patter addresses, then I can simply
resort to address scans.

Thanks,
-- 
Fernando Gont
SI6 Networks
e-mail: fgont@si6networks.com
PGP Fingerprint: 6666 31C6 D484 63B2 8FB1 E3C4 AE25 0D55 1D4E 7492

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