Re: proto-41 forwarding vs NAT traversal [Re: Tunneling scenarios and mechanisms evaluation]

["JORDI PALET MARTINEZ" <jordi.palet@consulintel.es>]

Hi Pekka,

Alain's comment was:
"NAT traversal must be supported." This is not true if the tunnel ends in the gateway where the NAT function is usually located. I think this is important, since the solution to deploy does not need to deal with complexity of NAT traversal.

What I understood then is 2 options:
1) The NAT box is already the IPv6 end point for the tunnel ? Correct if we prefer this instead of 6to4 (because probably the cost of implementing 6to4 is the same as a TB client in the NAT)
2) We don't need NAT traversal IF proto-41-forwarding is working in that NAT

By understanding is that the number of NATs that support proto-41 is comparable to the number of NATs that support Teredo (not sure other NAT traversal mechanism).

Regards,
Jordi

----- Original Message ----- 
From: "Pekka Savola" <pekkas@netcore.fi>
To: "JORDI PALET MARTINEZ" <jordi.palet@consulintel.es>
Cc: <v6ops@ops.ietf.org>
Sent: Saturday, March 13, 2004 6:52 AM
Subject: proto-41 forwarding vs NAT traversal [Re: Tunneling scenarios and mechanisms evaluation]


> On Sat, 13 Mar 2004, JORDI PALET MARTINEZ wrote:
> > I agree with Alain, that the way proto-41 fits. I'm not sure if we
> > can call this NAT traversal, so may be rewording to NAT traversal or
> > proto-41-forwarding ?
> 
> Alain did not mention proto 41 forwarding at all.. so I'm not sure 
> where you got that.
> 
> NAT traversal must work in a reasonably high number of different NAT
> boxes.  Proto-41 forwarding does not.  Of course, it can still be used
> as an optimization in the case it's being supported, but the case
> where it matters is basically the tunnel-server like approaches (TSP
> and STEP) which already support or will support NAT traversal.
> 
> -- 
> Pekka Savola                 "You each name yourselves king, yet the
> Netcore Oy                    kingdom bleeds."
> Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
>

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