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#!/bin/bash
iptables -F
iptables -X
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD DROP
iptables -N VPN-INPUT
iptables -A INPUT -i tun0 -j VPN-INPUT
iptables -A VPN-INPUT -p tcp -m multiport --dports 15000,16000 -j ACCEPT
iptables -A VPN-INPUT -s 10.8.0.103,10.8.0.104 -j ACCEPT
iptables -A VPN-INPUT -j DROP
iptables -A INPUT -i lo -j ACCEPT
iptables -A INPUT -p tcp ! --syn -m state --state NEW -j DROP
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p icmp --fragment -j DROP
iptables -A INPUT -p icmp --icmp-type echo-reply -j ACCEPT
iptables -A INPUT -p icmp --icmp-type echo-request -j ACCEPT
iptables -A INPUT -p icmp --icmp-type time-exceeded -j ACCEPT
iptables -A INPUT -p icmp --icmp-type fragmentation-needed -j ACCEPT
iptables -A INPUT -p ICMP -j DROP
iptables -A INPUT -p tcp --dport 22 -s 192.168.1.2 -j ACCEPT
iptables -A INPUT -m state --state INVALID -j DROP
iptables -A INPUT -s 192.168.1.2 -d 192.168.1.100 -p tcp -m tcp --dport 21 -m conntrack --ctstate NEW,ESTABLISHED -j ACCEPT
iptables -A INPUT -s 192.168.1.2 -d 192.168.1.100 -p tcp -m tcp --dport 20 -m conntrack --ctstate ESTABLISHED -j ACCEPT
iptables -A INPUT -s 192.168.1.2 -d 192.168.1.100 -p tcp -m tcp --sport 1024: --dport 1024: -m conntrack --ctstate ESTABLISHED,RELATED -j ACCEPT
iptables -A INPUT -p tcp -m multiport --dports 15000,16000 -j ACCEPT
iptables -A INPUT -p tcp --dport 1194 -j ACCEPT
iptables -A INPUT -s 192.168.1.2 -p tcp --dport 10000 -j ACCEPT

Chain INPUT (policy DROP)
target     prot opt source               destination         
VPN-INPUT  all  --  anywhere             anywhere            
ACCEPT     all  --  anywhere             anywhere            
DROP       tcp  --  anywhere             anywhere             tcp flags:!FIN,SYN,RST,ACK/SYN state NEW
ACCEPT     all  --  anywhere             anywhere             state RELATED,ESTABLISHED
DROP       icmp -f  anywhere             anywhere            
ACCEPT     icmp --  anywhere             anywhere             icmp echo-reply
ACCEPT     icmp --  anywhere             anywhere             icmp echo-request
ACCEPT     icmp --  anywhere             anywhere             icmp time-exceeded
ACCEPT     icmp --  anywhere             anywhere             icmp fragmentation-needed
DROP       icmp --  anywhere             anywhere            
ACCEPT     tcp  --  192.168.1.2          anywhere             tcp dpt:ssh
DROP       all  --  anywhere             anywhere             state INVALID
ACCEPT     tcp  --  192.168.1.2          192.168.1.100        tcp dpt:ftp ctstate NEW,ESTABLISHED
ACCEPT     tcp  --  192.168.1.2          192.168.1.100        tcp dpt:ftp-data ctstate ESTABLISHED
ACCEPT     tcp  --  192.168.1.2          192.168.1.100        tcp spts:1024:65535 dpts:1024:65535 ctstate RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere             multiport dports 15000,16000
ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:openvpn
ACCEPT     tcp  --  192.168.1.2          anywhere             tcp dpt:10000

Chain FORWARD (policy DROP)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain VPN-INPUT (1 references)
target     prot opt source               destination         
ACCEPT     tcp  --  anywhere             anywhere             multiport dports 15000.16000
ACCEPT     all  --  10.8.0.103           anywhere            
ACCEPT     all  --  10.8.0.104           anywhere            
DROP       all  --  anywhere             anywhere        

ACCEPT     all  --  anywhere             anywhere