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Posted by Paul Stewart, on 10-10-2009 19:55,
I just want to mention this regarding ICMP Unreachable/Port Unreachable (3/3). This is required because when a UDP Trace (Cisco and *NIX) reaches the destination, it produces an ICMP Unreachable/Port Unreachable. All intermediary hops in an ICMP Trace (Windows) or UDP Trace produce an ICMP TTL-Exceeded (11/0) message. There is a lot of misleading information that would lead one to believe one is for Windows and the other is for Cisco/Linux. In reality, one is for Windows and both are required for Cisco/Linux.
