#!/bin/bash

#Clears all firewall rules
iptables -F

#Allows tcp connections
iptables -A INPUT -p tcp --dport 25 -j ACCEPT
iptables -A INPUT -p tcp --dport 2222 -j ACCEPT
iptables -A INPUT -p tcp --dport 53 -j ACCEPT

#DROPS all packets
iptables -A INPUT -j DROP

#Allows ICMP ping but limits it
iptables -A INPUT -p icmp --icmp-type echo-request -m limit --limit 3/second --limit-burst 50 -j ACCEPT

#DOS Protection
iptables -A INPUT -p tcp --tcp-flags SYN,ACK,FIN,RST RST -m limit --limit 1/s -j ACCEPT

iptables -A INPUT -p tcp --syn -m limit --limit 1/s -j ACCEPT


exit 0