Blame extensions/libipt_ECN.man

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