RE: automatic tunneling and v6 interoperation

[Pekka Savola <pekkas@netcore.fi>]

On Thu, 13 Nov 2003, Christian Huitema wrote:
> > Could you describe how the Teredo host finds this relay (close to the
> > native host)?  Note that I was not describing the traffic from the
> native
> > host to a Teredo host.
> 
> This is actually documented in section 4.1.5 of the Teredo draft. The
> Teredo client sends an ICMP request to the IPv6 node, through the Teredo
> server. The native host receives the request over the native interface,
> and sends an ICMP reply. The ICMP reply is routed to the nearest Teredo
> relay over native IPv6. (Not routed very far if the gateway is on the
> host, but that is not necessary.) The Teredo client receives the reply
> from the relay, and associates the native IPv6 address to the IPv4 & UDP
> port of the relay. Further packets to that address are sent directly to
> this relay.

Ok, thanks -- missed that.

Who has the incentive of deploying Teredo servers then?  Assume there will
be 10,000,000 hosts implementing Teredo, and assuming that the users surf
the web, use the services, etc. and e.g. 1/10 of the traffic is going 
towards native destinations (could be a lot more as well).  Even if this 
would result in one new site in a minute, wouldn't there still be dozens 
or even hundreds of thousands ICMP packets passing through Teredo servers, 
if they would not be distributed as well?  (The number of packets would be 
quite high, and the associated state as well?)

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