extensions/libip6t_MARK.man - maze/iptables - Git at Google

 This is used to set the netfilter mark value associated with the
 packet.  It is only valid in the
 .B mangle
 table.
 .TP
 .BI "--set-mark " "mark"
	This is used to set the netfilter mark value associated with the
	packet. It is only valid in the
	.B mangle
	table.
	.TP
	.BI "--set-mark " "mark"