[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Comments: draft-nielsen-v6ops-3GPP-zeroconf-goals-00.txt
On Nov 4, 2004, at 11:23 AM, Bound, Jim wrote:
The spec once it speaks about tunneling is all over the place saying it
can support private addresses, NATs etc.
http://www.ietf.org/internet-drafts/draft-nielsen-v6ops-3GPP-zeroconf-go
als-00.txt
I think some of this is just impossible for mobility. A real case in
S.E. Asia right now looking at 3G IPv6 deployment has the following
problem. Mobile (seamless) nodes will use native IPv6 and IPv4 to get
to legacy apps that have not been ported to IPv6. In this case the
problem is that public IPv4 addresses are needed. But we know all that
and we must address that case. The other case is that to get to the IMS
networks first you havce to tunnel the packet through IPv4 network to
IMS IPv6 network. This is not going to work with NAT when the user is
roaming. So I don't see why the spec does not say this.
According to draft-nielsen-v6ops-3GPP-zeroconf-goals-00.txt (section 4.1. Applicability Assumptions)
the PDP context has to be terminated at the "home" network GGSN, even if the user
is actually roaming in a foreign network. Thus, even if private IPv4 addresses are used,
there would be no NAT between the UE an the tunnel server.
I think the confusion is coming from the introduction text:
> Configuration tunneling will in the 3GPP environment be deployed for
> the following purposes:
> - To provide temporary provisioning of basic IPv6 services, which
> users may deploy for the simplest IPv6 services only.
> - To allow an Operator, possibly a native IPv6 enabled Operator,
> to provide basic IPv6 services to users roaming into foreign
> networks which supports IPv4 bearer connectivity only.
In the second case, the fact that the foreign network is offering IPv4 only or
IPv6 only or a mix of the two is irrelevant as the PDP context will be terminated in the home network.
The introduction text should clarify this point.
I have other comments that I will sent in a different thread.
- Alain.