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Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)

Ole Troan <otroan@employees.org> Fri, 01 November 2019 12:22 UTC

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From: Ole Troan <otroan@employees.org>
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Date: Fri, 01 Nov 2019 13:22:09 +0100
Cc: Philip Homburg <pch-v6ops-9@u-1.phicoh.com>, v6ops@ietf.org
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To: Ted Lemon <mellon@fugue.com>
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Subject: Re: [v6ops] A broken promise - "You said PD Prefix Valid Lifetime is going to be X" (Re: SLAAC renum: Problem Statement & Operational workarounds)
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Ted,

>> This is how IPv6 renumbering has been specified for 20 years... I presume that was not news?
> 
> There have been efforts in the IETF to document how renumbering can be done in as minimally disruptive a way as possible (see e.g. Steinar’s message).   There are ISPs that believe that they are supposed to renumber end user addressing regularly to prevent (or at least complicate) prefix-based user tracking.  And there are ISPs that, if Fernando is to believed, and I think he is, do flash renumbering.
> 
> RFC 4192 doesn’t specify timeframes.   I think it’s a good document, but it doesn’t actually prescribe any detailed behavior.
> 
> So if none of the options I suggested have IETF consensus, is the answer to say “then we just assume that people will do whatever they want, and if they break things we’re okay with that?

Can you please read my message one more time?

Ole

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