Re: [v6ops] Need ref to 3GPP spec for the use of DHCPv6 Prefix Delegation, e.g. for smartphone tethering

Vízdal Aleš <ales.vizdal@t-mobile.cz> Mon, 07 October 2013 20:51 UTC

Return-Path: <ales.vizdal@t-mobile.cz>
X-Original-To: v6ops@ietfa.amsl.com
Delivered-To: v6ops@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 6DF0B11E8135 for <v6ops@ietfa.amsl.com>; Mon, 7 Oct 2013 13:51:35 -0700 (PDT)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -0.875
X-Spam-Level:
X-Spam-Status: No, score=-0.875 tagged_above=-999 required=5 tests=[AWL=0.075, BAYES_00=-2.599, HELO_EQ_CZ=0.445, HOST_EQ_CZ=0.904, MIME_8BIT_HEADER=0.3]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Fzn7rAWRisIt for <v6ops@ietfa.amsl.com>; Mon, 7 Oct 2013 13:51:31 -0700 (PDT)
Received: from ctxmailhub.t-mobile.cz (ctxmailhub.t-mobile.cz [93.153.104.87]) by ietfa.amsl.com (Postfix) with ESMTP id 7D7AF21E81BB for <v6ops@ietf.org>; Mon, 7 Oct 2013 13:51:28 -0700 (PDT)
Received: from srvhk503.rdm.cz (unknown [10.254.92.81]) by ctxmailhub.t-mobile.cz (Postfix) with ESMTP id 98FC52E09A5; Mon, 7 Oct 2013 22:51:26 +0200 (CEST)
Received: from SRVHKE02.rdm.cz ([fe80::94ce:8456:f6fa:86a8]) by srvhk503.rdm.cz ([fe80::a0bc:fdcc:adf9:5f66%12]) with mapi; Mon, 7 Oct 2013 22:51:26 +0200
From: Vízdal Aleš <ales.vizdal@t-mobile.cz>
To: Alexandru Petrescu <alexandru.petrescu@gmail.com>, "Rajiv Asati (rajiva)" <rajiva@cisco.com>, Mikael Abrahamsson <swmike@swm.pp.se>
Date: Mon, 07 Oct 2013 22:51:25 +0200
Thread-Topic: [v6ops] Need ref to 3GPP spec for the use of DHCPv6 Prefix Delegation, e.g. for smartphone tethering
Thread-Index: Ac7DfWnMnbciGzv/Snu7TDSliyMwewAGyDdw
Message-ID: <1808340F7EC362469DDFFB112B37E2FCD87724531C@SRVHKE02.rdm.cz>
References: <B14A62A57AB87D45BB6DD7D9D2B78F0B2AB673CE@xmb-rcd-x06.cisco.com> <5252C5C2.5080706@gmail.com> <1808340F7EC362469DDFFB112B37E2FCD87724529F@SRVHKE02.rdm.cz> <5252DCEF.6030705@gmail.com> <1808340F7EC362469DDFFB112B37E2FCD87724530A@SRVHKE02.rdm.cz> <5252E66D.3080005@gmail.com>
In-Reply-To: <5252E66D.3080005@gmail.com>
Accept-Language: en-US
Content-Language: en-US
X-MS-Has-Attach:
X-MS-TNEF-Correlator:
acceptlanguage: en-US
Content-Type: text/plain; charset="iso-8859-2"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
X-CFilter-Loop: Forwarded
Cc: "v6ops@ietf.org" <v6ops@ietf.org>
Subject: Re: [v6ops] Need ref to 3GPP spec for the use of DHCPv6 Prefix Delegation, e.g. for smartphone tethering
X-BeenThere: v6ops@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: v6ops discussion list <v6ops.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/v6ops>, <mailto:v6ops-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/v6ops>
List-Post: <mailto:v6ops@ietf.org>
List-Help: <mailto:v6ops-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/v6ops>, <mailto:v6ops-request@ietf.org?subject=subscribe>
X-List-Received-Date: Mon, 07 Oct 2013 20:51:35 -0000

> -----Original Message-----
> From: Alexandru Petrescu [mailto:alexandru.petrescu@gmail.com]
> Sent: Monday, October 07, 2013 6:51 PM
> To: Vízdal Aleš; Rajiv Asati (rajiva); Mikael Abrahamsson
> Cc: v6ops@ietf.org
> Subject: Re: [v6ops] Need ref to 3GPP spec for the use of DHCPv6 Prefix Delegation,
> e.g. for smartphone tethering
> 
> Le 07/10/2013 18:19, Vízdal Aleš a écrit :
> >>> There are no relays in the 3GPP case.
> >>
> >> There may be a misunderstanding here, because that 3gpp spec seems to
> >> mention Relay several times... like the Serving GW being the Relay
> >> and the PDN GW being the Server.
> >
> > Hmm there is one ... as the TS 24.302 mentioned earlier is
> > 'Architecture enhancements for non-3GPP accesses' and there is another
> > one TS 24.301 talking about the 3GPP access and that's the one I
> > believe you're looking for.
> >
> > http://www.3gpp.org/ftp/Specs/html-info/23401.htm (5.3.1.2.6	IPv6
> > Prefix Delegation via DHCPv6)
> 
> Ok I looked at that as well.
> 
> That section talks that the PDN GW being the DHCP Server.
> 
> That section does not mention the use of a Relay Agent.
> 
> However, given the number of intermediary boxes one sees between the UE and the
> PDN GW in figure 4.2.1-1 (e.g. Serving Gateway, PDN Gateway, more), one could
> hardly imagine that the UE and the PDN GW are neighbors in terms of IP.  I have a
> doubt about it.
> 
> BEcause of this doubt, I assume that there is a Relay Agent somewhere between the
> UE and the PDN GW (DHCP discovery phase would not work without a Relay Agent if
> the Server were not a neighbor).
> 
> This may be wrong though...

The GGSN/PGW is UEs next-hop as the traffic is tunnelled in GTP through all the intermediate nodes.
 
> This is why I wonder whether or not 3gpp uses DHCPv6 Relay Agent functionality, or
> not.
> 
> Alex
> 
> >
> > Ales

Ales