----- Original Message ----
> From: Sri Gundavelli <[email protected]>
> To: Behcet Sarikaya <[email protected]>
> Cc: [email protected]
> Sent: Tue, December 1, 2009 3:40:11 PM
> Subject: Re: [Softwires] Summary of the discussion Host based translation
> forv4-v4 within the same network.
>
> Hi Behcet,
>
>
> On Tue, 1 Dec 2009, Behcet Sarikaya wrote:
>
> > Hi Sri,
> >
> > GW-Init-DS-Lite is the DS-Lite with only home gateway mode. Access mode
> > is
> taken out on the grounds that it requires host modification.
>
> There is no need to touch the access architecture. Today's mobility
> architectures allow the mobility tunnel to carry both IPv4 and IPv6
> packets. We focus on tunnel stiching the mobility and CGN tunnels.
>
>
> > As such, GW-Init-DS-Lite seems to be aligned with or almost the same as
> > PMIPv6
> mobility solution described in Section 3 of
> draft-sarikaya-softwire-dslitemobility-01 where the gateway is LMA which is
> located at GGSN (we can say it is the AR) and home gateway is MAG which is
> located at SGSN.
> > Of course the above could accomodate GTP by removing LMA or MAG
> > terminology.
> >
> > Do you agree?
> >
>
> We do not initiate tunnels from MAG to CGN. The gateway in the Gateway
> initiated DS lite is not the first hop router, such as MAG, but a
> router at the end of the mobility tunnel. We also dont initiate tunnels
> from UE. And we dont require the CGN collocation with LMA, as we want
> to support IPv6 core.
As I said above, the gateway is not MAG, it is AR/GGSN/PGW or LMA.
In -01 draft we also removed CGN or AFTR colocation with LMA.
But I am curious about tunnel initiation for the UE.
Can you clarify that?
Tunnel initiated by LMA, would it work for PMIPv6? Maybe it is an allowed
feature, but restrict the operation into that specific choice?
I don't think it would work for GTP but I am not sure.
>
> We focus on the tunnel stitch and with requiring no changes to UE, or to
> the access architecture.
>
>
>
> > The other observation I have is that there are merits in the access
> > mode of DS-Lite. Access mode of DS-Lite matches well with DSMIPv6 where
> > the host has exactly the same functionality of encapsulating v4 in v6.
> > This is explained as DSMIPv6 mobility solution in Section 4 of the above
> > draft.
> >
>
>
> It will add the extra tunnel over ahead and requires host changes for
> supporting UE initiated mode. Instead we use the access tunnel and
> stitch it with the CGN tunnel.
Again, as I said above, DSMIPv6 UE already supports tunneling to HA and then
you can stich it to AFTR.
So previously called host based now is access mode I think has some uses.
Regards,
Behcet
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