#!/bin/sh
#
# iptables example configuration script
#
# Flush all current rules from iptables
#
iptables -F
iptables -t nat -F
iptables -t mangle -F

#
# Allow SSH connections on tcp port 22 (or whatever port you want to use)
#
iptables -A INPUT -p tcp --dport 2111 -j ACCEPT

#
# Set default policies for INPUT, FORWARD and OUTPUT chains
#
iptables -P INPUT DROP                #using DROP for INPUT is not always recommended. Change to ACCEPT if you prefer.
iptables -P FORWARD ACCEPT
iptables -P OUTPUT ACCEPT

#
# Set access for localhost
#
iptables -A INPUT -i lo -j ACCEPT

#
# Accept packets belonging to established and related connections
#
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT

#
#Accept connections on 1194 for vpn access from clients
#Take note that the rule says "UDP", and ensure that your OpenVPN server.conf says UDP too
#
iptables -A INPUT -p udp --dport 1194 -j ACCEPT

#
#Apply forwarding for OpenVPN Tunneling
#
iptables -A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
iptables -A FORWARD -s 10.8.0.0/24 -j ACCEPT
iptables -A FORWARD -s 10.8.1.0/24 -j ACCEPT
iptables -A FORWARD -j REJECT

#FOR ASSIGNING DIFFERENT PUBLIC IPS TO OPENVPN USERS
iptables -t nat -A POSTROUTING -s 10.8.0.1/24 -j SNAT --to-source VPNPUBLICIPHERE
iptables -t nat -A POSTROUTING -s 10.8.1.1/24 -j SNAT --to-source SECONDARYVPNPUBLICIP

#
# Some generally optional rules. Enable and disable these as per your requirements
#

# Accept traffic with the ACK flag set
iptables -A INPUT -p tcp -m tcp --tcp-flags ACK ACK -j ACCEPT
# Accept responses to DNS queries
iptables -A INPUT -p udp -m udp --dport 1024:65535 --sport 53 -j ACCEPT
# Accept responses to our pings
iptables -A INPUT -p icmp -m icmp --icmp-type echo-reply -j ACCEPT
# Accept notifications of unreachable hosts
iptables -A INPUT -p icmp -m icmp --icmp-type destination-unreachable -j ACCEPT
# Accept notifications to reduce sending speed
iptables -A INPUT -p icmp -m icmp --icmp-type source-quench -j ACCEPT
# Accept notifications of lost packets
iptables -A INPUT -p icmp -m icmp --icmp-type time-exceeded -j ACCEPT
# Accept notifications of protocol problems
iptables -A INPUT -p icmp -m icmp --icmp-type parameter-problem -j ACCEPT
# Respond to pings
iptables -A INPUT -p icmp -m icmp --icmp-type echo-request -j ACCEPT
# Accept traceroutes
iptables -A INPUT -p udp -m udp --dport 33434:33523 -j ACCEPT

#
# List rules
#
iptables -L -v
service openvpn restart
service iptables save