/etc/network/if-up.d/iptables

iptables

#!/bin/sh
iptables -F
iptables -X

iptables -A INPUT -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 22 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A OUTPUT -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

iptables -A INPUT -p udp -m udp --dport 64738 -j ACCEPT
iptables -A INPUT -p tcp -m tcp --dport 64738 -j ACCEPT

iptables -A OUTPUT -p udp -m udp --sport 64738 -j ACCEPT
iptables -A OUTPUT -p tcp -m tcp --sport 64738 -j ACCEPT

iptables -A OUTPUT -p udp -o eth0 --dport 53 -j ACCEPT
iptables -A INPUT -p udp -i eth0 --sport 53 -j ACCEPT

iptables -A INPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 80 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 443 -m state --state NEW,ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT
iptables -A INPUT -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

iptables -A INPUT -p tcp --sport 6667 -m state --state ESTABLISHED -j ACCEPT
iptables -A OUTPUT -p tcp --dport 6667 -m state --state NEW,ESTABLISHED -j ACCEPT

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

iptables -N LOGGING
iptables -A INPUT -j LOGGING
iptables -A OUTPUT -j LOGGING
iptables -A LOGGING -m limit --limit 2/min -j LOG --log-prefix "IPTables-Dropped: " --log-level 4
iptables -A LOGGING -j DROP