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Re: A common problem with SLAAC in "renumbering" scenarios

Lorenzo Colitti <lorenzo@google.com> Wed, 20 February 2019 07:36 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Wed, 20 Feb 2019 16:35:49 +0900
Message-ID: <CAKD1Yr0t8MEg-SRukTKM9VjLSaJB4tc-uhxJkX2U-3gQX2PvWQ@mail.gmail.com>
Subject: Re: A common problem with SLAAC in "renumbering" scenarios
To: Mark Smith <markzzzsmith@gmail.com>
Cc: Mikael Abrahamsson <swmike@swm.pp.se>, Fernando Gont <fgont@si6networks.com>, 6man WG <ipv6@ietf.org>
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On Wed, Feb 20, 2019 at 4:19 PM Mark Smith <markzzzsmith@gmail.com> wrote:

> So while the addresses were removed from the interface, the TCP
> connection entirely survived that, and treated the link down/up event
> as a period of packet loss.
>

That doesn't really make sense on a mobile platform. When you switch from
wifi to cell data, you probably don't want to keep that connection alive
until that specific wifi network comes back. Instead you want to give the
app an error as soon as possible so it can retry the failed connection on
the new network. On Android, TCP connections are closed the instant their
IP address goes away. I don't know what iOS does.

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