Add Comments to iptables Rules + Bash Function to add DNAT rule with comment

iptables rule with comments + DNAT rule function

Add Comments to iptables Rules:

	Depending on your distribution, you may need to load the 'ipt_comment' or 'xt_comment' modules into your running kernel first.
	like: 'modprobe ipt_comment'

	EXAMPLE:
	iptables -A INPUT -j DROP -p tcp --dport 22222 -m comment --comment "test iptables rule comment"



Bash Function to add DNAT rule with comment:

add_dnat_rule(){
	if ! [ "$#" = "3" ];then
		echo -e "\t ERROR: not enought arguments.\n"
		echo -e "\n EXAMPLE:\n add_dnat_rule 192.168.18.101:3389 53891 \"RDP: My SERVER\"\n\n"
		exit 1
	fi
	GW_NET="78.47.164.190" # gateway public IP to publish port on it
	/sbin/iptables -t nat -A PREROUTING -d $GW_NET -p tcp -m tcp --dport $2 -j DNAT --to-destination $1 -m comment --comment "$3"
}