IPTables configuration in Ubuntu 13.04. Secure your ports!

IPTables, block ports

Got this from: https://help.ubuntu.com/community/IptablesHowTo

IPTables setup, which will load and save configurations made in IPTables.

This default setup will block every port except for 80 and 22.

First create the files below in
/etc/iptables.rules
/etc/network/if-post-down.d/iptablessave
/etc/network/if-pre-up.d/iptablesload

and then:
sudo chmod +x /etc/network/if-post-down.d/iptablessave
sudo chmod +x /etc/network/if-pre-up.d/iptablesload

iptables.rules

# Generated by iptables-save v1.3.1 on Sun Apr 23 05:32:09 2006
*filter
:INPUT ACCEPT [273:55355]
:FORWARD ACCEPT [0:0]
:LOGNDROP - [0:0]
:OUTPUT ACCEPT [92376:20668252]
-A INPUT -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 22 -j ACCEPT
-A INPUT -i eth0 -p tcp -m tcp --dport 80 -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -j LOGNDROP
-A LOGNDROP -p tcp -m limit --limit 5/min -j LOG --log-prefix "Denied TCP: " --log-level 7
-A LOGNDROP -p udp -m limit --limit 5/min -j LOG --log-prefix "Denied UDP: " --log-level 7
-A LOGNDROP -p icmp -m limit --limit 5/min -j LOG --log-prefix "Denied ICMP: " --log-level 7
-A LOGNDROP -j DROP
COMMIT
# Completed on Sun Apr 23 05:32:09 2006

iptablesload

#!/bin/sh

iptables-restore < /etc/iptables.rules

exit 0

iptablessave

#!/bin/sh

iptables-save -c > /etc/iptables.rules

if [ -f /etc/iptables.downrules ]; then
   iptables-restore < /etc/iptables.downrules
fi

exit 0