RST and ICMP

Both RSTs and FINs (eventually) result in a teardown, but the previous state listing did not reference RST at all.

A RST can be thought of as aborting the connection (i.e. ESTABLISHED directly to TIME-WAIT/CLOSED).

For those with Linux experience, a good analogy is how 'kill -9' terminates a process regardless of what the process is currently doing.

In TCP, a RST usually takes the place of an ICMP Port Unreachable message for closed ports.

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