extensions/libipt_ECN.man - maze/iptables - Git at Google

 This target allows to selectively work around known ECN blackholes.
 It can only be used in the mangle table.
 .TP
 .BI "--ecn-tcp-remove"
 Remove all ECN bits from the TCP header.  Of course, it can only be used
 in conjunction with
 .BR "-p tcp" .
	This target allows to selectively work around known ECN blackholes.
	It can only be used in the mangle table.
	.TP
	.BI "--ecn-tcp-remove"
	Remove all ECN bits from the TCP header. Of course, it can only be used
	in conjunction with
	.BR "-p tcp" .