[CLUE-Tech] NAT blocks P2P?

[Angelo Bertolli]

You're right, the main problem is when both sides are behind a NAT you 
lose end-to-end connectivity.  The problem with port forwarding is if 
there are two users behind the NAT who want to do the same thing, they 
cannot listen on the same outside port.  But I believe this is a 
necessary trade-off.  You can't increase the namespace of IP addresses 
endlessly without restrictions.

But I don't think it's a problem.  All it takes is one or more nodes to 
be "visible" and the problem can be solved by using them as a resource 
to connect other nodes which are behind NAT.


>
> I think the real issue here is "end-to-end"ed-ness.  I first heard 
> about it from KC Claffy at CAIDA.  I don't understand it completely 
> yet (it was actually described in another paper and she just mentioned 
> it).  But smart people are concerned so I wouldn't dismiss it.
>
> KC's talk is at: 
> http://www.caida.org/outreach/presentations/2003/netproblems_lisa03/
>
> Dave
>
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