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

Pierre Pfister <pierre.pfister@darou.fr> Fri, 17 October 2014 06:52 UTC

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From: Pierre Pfister <pierre.pfister@darou.fr>
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Date: Fri, 17 Oct 2014 08:52:25 +0200
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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>, Lorenzo Colitti <lorenzo@google.com>
Subject: Re: [homenet] Let's make in-home ULA presence a MUST !?
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Hello Mikael,

Le 17 oct. 2014 à 08:45, Mikael Abrahamsson <swmike@swm.pp.se> a écrit :

> On Fri, 17 Oct 2014, Lorenzo Colitti 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?
> 
> 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.

There are two different things

If you loose WAN connectivity, you send RAs with router-lifetime set to zero. Meaning you are not a default route.  (RFC7084 - G-4)
If you loose a DP, you send RAs with PIO lifetimes set to ‘prefered’=0 and ‘valid’=min(DP lifetime, 2 hours).  (RFC7084 - L-13)

So the host can keep using the prefix during 2 hours. The preferred lifetime set to zero would of course suggest him to use a different one instead.

> 
> 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?
> 
> -- 
> Mikael Abrahamsson    email: swmike@swm.pp.se
> 
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