iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT
#!/bin/bash
sysctl -w net.ipv4.ip_forward=1
iptables -F -t filter
iptables -F  nat

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

iptables -A INPUT -p tcp --dport 22 -j ACCEPT
iptables -A OUTPUT -p tcp --sport 22 -j ACCEPT

iptables -A INPUT -p tcp -m multiport --dports 53,80,21 -j ACCEPT
iptables -A OUTPUT -p tcp -m multiport --sports 53,80,21 -j ACCEPT