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This allows you to match the ECN bits of the IPv4 and TCP header. ECN is the Explicit Congestion Notification mechanism as specified in RFC3168
.TP
.BI "--ecn-tcp-cwr"
This matches if the TCP ECN CWR (Congestion Window Received) bit is set.
.TP
.BI "--ecn-tcp-ece"
This matches if the TCP ECN ECE (ECN Echo) bit is set.
.TP
.BI "--ecn-ip-ect " "num"
This matches a particular IPv4 ECT (ECN-Capable Transport). You have to specify
a number between `0' and `3'.
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