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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> Tue, 08 October 2013 08:49 UTC

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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: Tue, 08 Oct 2013 10:49:04 +0200
Thread-Topic: [v6ops] Need ref to 3GPP spec for the use of DHCPv6 Prefix Delegation, e.g. for smartphone tethering
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Subject: Re: [v6ops] Need ref to 3GPP spec for the use of DHCPv6 Prefix Delegation, e.g. for smartphone tethering
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> > The GGSN/PGW is UEs next-hop as the traffic is tunnelled in GTP
> > through all the intermediate nodes.
> 
> Ah, right, there is a GTP tunnel above all the intermediary IP nodes.
> 
> However, even when a tunnel is dynamically set up, a routing table entry is added in
> the Relay's routing table (or other similar entry).  The parameters of that entry
> necessarily include, among others, the prefix which is allocated.
> 
> No?

The tunnel stays up for the lifetime of the PDP/PDN context. There is no relay in the 3GPP access
architecture. If the tunnel drops the PGW/GGSN will remove the route from their routing table,
once a new tunnel is setup the routing table is updated accordingly.

> Alex

Ales

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