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Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios

Mikael Abrahamsson <swmike@swm.pp.se> Thu, 31 January 2019 14:23 UTC

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Date: Thu, 31 Jan 2019 15:23:00 +0100
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Richard Patterson <richard@helix.net.nz>
cc: Fernando Gont <fgont@si6networks.com>, IPv6 Operations <v6ops@ietf.org>, "6man@ietf.org" <6man@ietf.org>
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Subject: Re: [v6ops] A common problem with SLAAC in "renumbering" scenarios
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On Thu, 31 Jan 2019, Richard Patterson wrote:

> I think this requirement already resolves the CPE-side of things, and
> the rest I believe, is solved server-side?
> If the CPE is hard rebooted, it hasn't sent a Release, so I'd expect
> the lease-state to be kept server-side, and re-offered if the DUID+MAC
> binding is the same when the CPE reconnects.
>
> Although, during soft reboots, I have often seen CPEs sending a
> Release, telling the servers to relinquish the lease.  Perhaps we
> should discuss the benefits/detriments of doing this?

This is a good point. On our HGWs we disabled ever sending release just to 
try to always give the same prefix to the customer.

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

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