Re: [homenet] Let's make in-home ULA presence a MUST !?

Lorenzo Colitti <lorenzo@google.com> Fri, 17 October 2014 06:53 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Fri, 17 Oct 2014 15:53:15 +0900
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To: Mikael Abrahamsson <swmike@swm.pp.se>
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Cc: "homenet@ietf.org" <homenet@ietf.org>, Ted Lemon <mellon@fugue.com>
Subject: Re: [homenet] Let's make in-home ULA presence a MUST !?
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On Fri, Oct 17, 2014 at 3:45 PM, Mikael Abrahamsson <swmike@swm.pp.se>
wrote:

> You keep mentioning this, but you're incorrect. Even if the ISP
>> flash-renumbers, hosts will not lower the lifetime of their IP addresses
>> below 2 hours, per RFC 4862.
>>
>
> Where in RFC4862 is this described?
>

http://tools.ietf.org/html/rfc4862#section-5.5.3 point e).


>
> A lot of time was spent on RF7084 and its predecessor, making sure it was
> a requirement to send RAs with zero-lifetime for the on-link prefix if the
> delegated prefix went away, so hosts would stop using it very quickly.


> So my expectation if the ISP flash-renumbered (ie reset the PPPoE session,
> the physical uplink went down or the DHCPv6-PD lease expired), an RFC7084
> compatible router would send out RAs with zero-lifetime and hosts would
> immediately stop using these IPs for new connections. Am I wrong, and where
> can I read up on the behaviour you're describing?


Deprecated addresses can still be used until their valid lifetime expires.