So sometimes you see a TCP handshake with those two flags, but that doesn't mean there is congestion.Ĭongestion would be signaled by layer 3 devices during data transfer, which should result in the sender slowing down it's data rate, but as far as I know that never happened or worked well - the congestion happens to fast for the notification to be efficient.Īnd yes, a reset at the end of a connection is nothing unusual, as it frees up resources quicker than a FIN/ACK FIN/ACK teardown. ECN and CWR are related to bandwidth congestion, but in a SYN or SYN/ACK packet they're just parameters to tell the other receiver of that packet that it's a mechanism understood by the sender.
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