ICMP/Traceroute Question

From: Lab Rat #109385382 (techlist01@gmail.com)
Date: Sun Nov 12 2006 - 18:10:06 ART

What's the difference between ICMP unreachable versus ICMP port-unreachable?

And what are the icmp-types for Traceroute? I have seen "echo-reply",
"time-exceeded", "unreachable", "port-unreachable" and any combination of
the four listed in various solutions. If I'm asked a question to allow
Traceroute back in an ACL, which ones do I have to consider?

Thanks,

Ed

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