Re: Opportunistic Tunneling

[Pekka Savola <pekkas@netcore.fi>]

Responding a to few points you raised..

On Tue, 17 Feb 2004, JORDI PALET MARTINEZ wrote:
> I believe proto-41 is also one of the proposals on the table for
> both unmanaged and 3GPP.
> 
> For example, TSP can make use of it. We also have a Tunnel Broker
> implementation that does.

Note that while proto-41 forwarding is probably useful in e.g. 
unmanaged scope in general, it is not really applicable to this 
specific topic, "opportunistic tunneling", where the tunneling is 
autoomatic, and requires no supporting ISPs.  E.g., tunnel brokers are 
out of scope for this topic.

Ignoring proto-41 however...

[...]
> When users start moving with IPv6 devices, we need to ensure that
> they are able to use it, despite what network they are sitting on.
> 
> I've this experience myself, traveling ... and I can solve it
> manually most of the time, but the users don't know how to. It
> should be automatic.
> 
> There are already applications that only work with IPv6, a few at
> the time being, but more coming, for sure. The reason is that you
> need addresses, for example to access multiple devices that are
> located behind a NAT box.

I totally agree (about part of your statement) that tunneling should 
just work, whether the user is behind NAT or not.

However, regarding this discussion, I'm not sure if you're actually 
taking a stance whether you you believe a mechanism like 6to4 or 
Teredo is *required*.  That is, do you think the users must be able to 
switch on IPv6, without any interaction with any ISP, and have it work 
(at least with a subset of other IPv6 users)?  Or do you think the 
user can be required to get a "tunnel broker" -like service (or 
whatever) from some ISP explicitly?
 
[...]
> In Euro6IX we are already working around this idea, but we don't
> have a draft ready for this meeting, unfortunately. Basically we
> call it "auto-transition". We need to ensure that the best possible
> transition mechanism work automatically at any time, in any network.
[...]

Yep -- this is pretty important work, and one important issue in the 
unmanaged evaluation document (spanning both "opportunistic" and 

-- 
Pekka Savola                 "You each name yourselves king, yet the
Netcore Oy                    kingdom bleeds."
Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings