I'm not a master of the internet RFCs, but I do believe icmp messages have
different types.
Now to enable traceroute for IPFW, I might put in a rule like this:
ipfw add pass icmp from any to me
However, how would I make a rule to limit icmp messages to just those used
by traceroute? Can the messages be distinguished as such?
A dynamic rule that exists only for the duration of a traceroute execution
would be even better. I take it 'setup' or 'check-state' would follow in
that case?
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