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Date: Tue, 01 May 2012 12:59:36 +0100
From: Arthur Chance <freebsd@qeng-ho.org>
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Subject: Limiting closed port RST response
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Every once in a while the nightly periodic security checks tell me I've 
got a kernel message

Limiting closed port RST response from N to 200 packets/sec

where N > 200. The problem is that it doesn't say which port was 
involved. Is there any way to find that out so I can try tracking down 
the problem? AFAICT tcpdump doesn't have a way saying "closed ports on 
this machine" as a filter.