opening port for SSH

[Edwin Kapauni <edwinkapauni@arcor.de>]

 From the recent thread 
<http://www.spinics.net/lists/netfilter/msg33021.html> I have adopted 
this ruleset for a standalone computer.

Now, I need some help teaching me how to open ports for SSH and VoIP.
That shouldn't be too difficult, right?

######################### start ###########################


iptables -F
iptables -X
iptables -Z
iptables -t nat -F
iptables -t nat -X
iptables -t nat -Z
iptables -t mangle -F
iptables -t mangle -X
iptables -t mangle -Z


iptables -P INPUT DROP
iptables -P FORWARD DROP
iptables -P OUTPUT ACCEPT


iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p icmp --icmp-type 3 -j ACCEPT
iptables -A INPUT -p icmp --icmp-type 11 -j ACCEPT
iptables -A INPUT -p icmp --icmp-type 12 -j ACCEPT
iptables -A INPUT -p tcp --syn --dport 113 -j REJECT --reject-with tcp-reset


############################# end #################################

Thanks for any help.