Since no ICMP error message is generated in response to an ICMP error message, how are the errors in errorneous ICMP messages detected, or is the message discarded?
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If you send to a connected UDP socket and the target UDP port isn't open, the sending application will get an ICMP UNREACHABLE error. So the premiss of your question is false. – user207421 May 10 '15 at 08:04
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If error messages were generated in response to error messages, you could end up with a loop. It's more important to ensure loops and traffic storms aren't created, so bad ICMP messages are just ignored.
Jay Kominek
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