1 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 2 .TP 3 [\fB!\fP] \fB\-\-ecn\-tcp\-cwr\fP 4 This matches if the TCP ECN CWR (Congestion Window Received) bit is set. 5 .TP 6 [\fB!\fP] \fB\-\-ecn\-tcp\-ece\fP 7 This matches if the TCP ECN ECE (ECN Echo) bit is set. 8 .TP 9 [\fB!\fP] \fB\-\-ecn\-ip\-ect\fP \fInum\fP 10 This matches a particular IPv4 ECT (ECN-Capable Transport). You have to specify 11 a number between `0' and `3'. 12
