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+Firewalk is a network auditing tool that attempts to
+determine what transport protocols a given gateway will
+pass. Firewalk works by sending out TCP or UDP packets
+with a TTL one greater then the targeted gateway. If the
+gateway allows the traffic, it will forward the packets to
+the next hop where they will expire and elicit an
+ICMP_TIME_EXCEEDED message. If the gateway host does not
+allow the traffic, it will likely drop the packets on the
+floor and we will see no response.
+
+WWW: http://www.packetfactory.net/firewalk/