RE: 3gpp-analysis document and automatic tunneling

["Karim El-Malki (EAB)" <Karim.El-Malki@era.ericsson.se>]

 > On Tue, 27 May 2003, Fred L. Templin wrote:
 > > Pekka Savola wrote:
 > > > On Tue, 27 May 2003, Karim El-Malki (EAB) wrote:
 > > >>I have used ISATAP in 2.5 & 3G mobile networks and think it
 > > >>is a very relevant mechanism. What is your experience of
 > > >>these mechanisms in mobile networks that makes you say this?
 > > > 
 > > > 
 > > > ISATAP doesn't allow you you to connect more than a 
 > single host.  It
 > > > doesn't allow routers or networks (e.g. a /64 as 
 > recommended to the 3GPP).  
 > > > Thus, I see it being of little use at least in the 
 > 3GPP-specific part.
 > > 
 > > I don't know exactly the scenarios Karim is referring to, 
 > and I don't
 > > quite understand Pekka's comment. But, I do see a use case 
 > for ISATAP
 > > in the text of section 3.1 of "Analysis on IPv6 Transition in 3GPP
 > > Networks".
 > > 
 > > Whether/not the case described in this section will be 
 > common is a point
 > > which can't be proven until significant 3G deployment has 
 > occurred, but
 > > ISATAP does seem to provide a good fit.
 > 
 > I haven't read the analysis in detail, but the latest 
 > Scenarios draft at
 > least *seems* to very explicitly mention that GGSN supports 
 > both IPv4 and
 > IPv6.

I am pretty certain that's not what the doc says.
First, the fact that the GGSN can support IPv6 and IPv4 routing does
not mean that it has support for IPv6 native connectivity to mobile hosts.
Secondly we cannot guarantee that all GGSNs from all operators
will support IPv6 at the same time. Some GGSNs will only support
IPv4 as they do today.

/Karim