-----Original Message-----
From: ietf-bounces(_at_)ietf(_dot_)org
[mailto:ietf-bounces(_at_)ietf(_dot_)org] On
Behalf Of Sabahattin Gucukoglu
Sent: Wednesday, March 31, 2010 5:43 PM
To: ietf(_at_)ietf(_dot_)org
Subject: NAT Traversal With ICMP Replies
http://samy.pl/pwnat/
The idea is that NATs let back ICMP replies and send them to
hosts behind them if they suspect them to be responses to
messages sent from those hosts. So, by making the reply
fixed and having a server behind a NAT continuously sending
the ICMP query that would elicit it, a server can learn a
client's IP address, and thus begin communication without a
central rendezvous server.
An interesting idea, for sure.
Several drawbacks, though, including no provision for multiple
PWNAT devices behind the same NAT. Varying the ICMP query
address could resolve that, to some degree (modulo birthday
collisions).
It might not be super
efficient, and there's the question of whose network gets all
these ICMP messages.
http://ws.arin.net/whois/?queryinput=3.0.0.0
Are we using it anywhere already?
We = IETF? No.
-d
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