Re: Opportunistic Tunneling

[itojun@iijlab.net]

>> >TSP requires that ISPs set up tunnel servers and tunnel brokers.  
>> >6to4 and Teredo don't.  (Teredo server doesn't pass through traffic so
>> >a couple may be enough.)  6to4 works automatically between other 6to4
>> >nodes; TSP does not.  Teredo works automatically between Teredo nodes
>> >after the server has been contacted to get the public IPv6 address.
>> 
>> 	6to4 requires 6to4 relay routers to be present on the internet,
>> 	otherwise 6to4 won't work (or return route will be very inefficient).
>> 	teredo requires teredo servers/relays to be present on the internet,
>> 	otherwise teredo client won't work.
>
>Relay routers are needed to communicate with native Internet, not 
>between the users of the same transition technology.
>
>Both 6to4 and Teredo can work, to an extent, when relay routers don't 
>exist.  TSP can't.

	how useful is the IPv6 internet if you can talk with 6to4 users only?
	i think the argument is bogus.

>There is path optimization between 6to4 nodes and between Teredo 
>nodes.  There is no such thing with TSP (for the good and the bad).  
>I.e., all the traffic must pass through the server/broker.

	i think it causes serious misunderstanding if we characterize this
	property as indication of "opportunistic".  optimization property
	has to be discussed under separate thread.

itojun