Re: [v6ops] draft-ietf-v6ops-mobile-device-profile last call

Lorenzo Colitti <lorenzo@google.com> Mon, 23 February 2015 08:10 UTC

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From: Lorenzo Colitti <lorenzo@google.com>
Date: Mon, 23 Feb 2015 17:09:29 +0900
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To: "<mohamed.boucadair@orange.com>" <mohamed.boucadair@orange.com>
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Cc: V6 Ops List <v6ops@ietf.org>
Subject: Re: [v6ops] draft-ietf-v6ops-mobile-device-profile last call
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On Mon, Feb 23, 2015 at 4:59 PM, <mohamed.boucadair@orange.com> wrote:

> NEW:
>
>              *  If the requested IPv4v6 PDP-Context is not supported by
>                 the network, but IPv4 and IPv6 PDP types are allowed,
>                 then the cellular host will be configured with an IPv4
>                 address or an IPv6 prefix by the network.  It must
>                 initiate another PDP-Context activation in addition to
>                 the one already activated for a given APN (Access Point
>                 Name).  The purpose of initiating a second PDP-Context
>                 is to achieve dual-stack connectivity by means of two
>                 PDP-Contexts.
>

Operators who have deployed IPv6 report that running dual-stack over two
PDP contexts is a very bad idea because it consumes 2x the network
resources. Please don't recommend this unless you have evidence that this
works well in production (not in testing).


> NEW:
>                 Note, a cellular host changing its connection between an
>                 IPv6-specific APN and an IPv4-specific APN will
>                 interrupt associated network connections.  This may be
>                 considered as a brokenness situation for some
>                 applications.
>

What is the purpose of this text? Mobile nodes change IP addresses all the
time (e.g., when switching from 4G to wifi). How is this different?