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Using DCC command<br />
Client NATed behind firewall, port N is closed<br />
Client sends a DCC command to a valid IRC server<br />
Firewall creates expectation and laptop can open a connection<br />
Éric Leblond, Victor Julien (OISF) <strong>The</strong> <strong>menace</strong> <strong>came</strong> <strong>from</strong> <strong>below</strong> <strong>Hack</strong>.<strong>lu</strong> 2012 16 / 66