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Re: Address privacy

Ted Lemon <mellon@fugue.com> Thu, 30 January 2020 19:10 UTC

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Subject: Re: Address privacy
From: Ted Lemon <mellon@fugue.com>
In-Reply-To: <30220.1580410995@dooku>
Date: Thu, 30 Jan 2020 14:10:32 -0500
Cc: 6man WG <ipv6@ietf.org>
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References: <03C832CE-7282-4320-BF1B-4CB7167FE6BE@employees.org> <1962.1579823388@localhost> <f83ab037-9125-bb74-dbac-68850aeb1020@huitema.net> <CBB23ABE-A7A3-4208-873C-E47EE063E34B@fugue.com> <11855.1579980079@localhost> <CALx6S36V_VjaxhELYcsgDYLWsCkj20p6gtiY9T9Q=9-9Oibyjw@mail.gmail.com> <32626.1580060558@localhost> <CALx6S37prWACD0jv9c-XHD-JtPqZAcgeT2Ax0EZHkiQaDR4t=g@mail.gmail.com> <419b7c7a-e364-7951-5a44-6c39e1da65fb@joelhalpern.com> <CALx6S36802oDaEgojAPq2c6hM_s1BayidXPh1Sc6RZmZa9UHpQ@mail.gmail.com> <6c5ba72d-9289-90ba-a1c9-2307ed29a4da@foobar.org> <a98bf2ab-32e7-459b-14d2-5e0e1c65a229@si6networks.com> <CALx6S36J5TPnXJQyMW2NUbQV6KL_oqUQ01m+BEzBJ+xcHpmQWw@mail.gmail.com> <bc0d1eb8-2301-224d-dc33-19f6a60e593e@si6networks.com> <CALx6S34i67ivt8t1P3omRVzsj9NfxY2t41JLjmjT6X0vtBQHKQ@mail.gmail.com> <1fc7816e-6179-28d6-7b11-be2027561a54@si6networks.com> <CALx6S37KXfLE22uHMZTD41+jR7fdZd9PZGqO-r4SE2LehtN=Gg@mail.gmail.com> <2d312ecf-e037-5c24-28d7-2a2c3dc06363@si6networks.com> <CALx6S3 7A1QzR0PhDUzujXGiB+a-9c1qG4g8TE8KOcxOLKP18TQ@mail.gmail.com> <42900FAF-7FD8-46D8-9831-5B9E520814BB@fugue.com> <CALx6S36f41nbj=2fibt9X2EpDO1Rz6o2Fm-QeNMvUfzPCu10jw@mail.gmail.com> <CAO42Z2xhmmrYqkBYF9PNSEtyRaZs8bdj_5DjYYk8Bc040OGCmw@mail.gmail.com> <CALx6S36TsYAJgD=s=vA=RpwRsPvQYKagnQB8kXp2mABRLP4HoQ@mail.gmail.com> <30220.1580410995@dooku>
To: Michael Richardson <mcr+ietf@sandelman.ca>
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On Jan 30, 2020, at 2:03 PM, Michael Richardson <mcr+ietf@sandelman.ca> wrote:
> A stable private address may be good enough, if it is okay for the device to
> resume the same address whenever it returns to that location. 

One thing to think about is /why/ the device needs the same address over and over again.  It’s because something wants to contact it.  In order for something to contact it, that something has to have a pointer to it.   Where did it get the pointer?   If that’s a public place, then privacy is somewhat out the window, but nevermind that for the moment.   If it’s a /private/ place, then as long as, when your address changes because you moved locations, you update that registration, then there’s no need to return to the address you had before at a particular location when you return to that location.

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