Re: [v6tc] Re: Tunneling and Transition Drafts

Francis Dupont <Francis.Dupont@enst-bretagne.fr> Fri, 08 April 2005 18:08 UTC

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From: Francis Dupont <Francis.Dupont@enst-bretagne.fr>
To: Jeroen Massar <jeroen@unfix.org>
Subject: Re: [v6tc] Re: Tunneling and Transition Drafts
In-reply-to: Your message of Fri, 08 Apr 2005 13:46:52 +0200. <1112960812.26936.57.camel@firenze.zurich.ibm.com>
Date: Fri, 08 Apr 2005 20:06:35 +0200
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 In your previous mail you wrote:

   Since when does proto-115 cross NAT's ?
   
   L2TP typically does not work for the same reason why proto-41 does not
   work: NAT boxes don't forward proto-41 nor proto-115.
   
=> usually L2TP is run over UDP, not protocol 115.

   Also L2TP has the limitation that it requires authenticated use, which

=> I don't understand your concern: is it about the optional shared secret
to protect L2TP control or PPP authentication?

   was not acceptable according to some people on this and the v6ops list.
   
   One conclusion I can make from all these discussions is though that:
   - There are a number of mechanisms
   - These mechanisms all have their distinct advantages
   
=> I agree but not for the same reasons...

   My take on this thus becomes:
   - In general tunneling IPv6 over UDP works *everywhere*
     (unless there is an administrative filter prohibiting it
      in which case we should not try to override it either)

=> there are two very different instances of this: Teredo and L2TP.
I don't believe we need a third one.

   - TSP is deployed and works (*)
   
=> yeah! TSP is great in the (common) cases you can use it. Perhaps too
great so there are not enough TSP services where I am...

Regards

Francis.Dupont@enst-bretagne.fr

PS: I don't believe we have to spend a lot of time on marginal improvements:
the ultimate target should to get *native* IPv6!

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