IP Tables Configurations

set_iptables.sh

#!/bin/bash

# Flush all current rules
iptables -F

# Accept SSH Connections
iptables -A INPUT -p tcp --dport 22 -j ACCEPT

iptables -P INPUT DROP # By default, drop all incoming connections
iptables -P FORWARD DROP # By default refuse to forward packets
iptables -P OUTPUT ACCEPT # By default accept all outgoing connections

# Allow connections to 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 TCP packets on PORT 80
iptables -A INPUT -p tcp --dport 80 -j ACCEPT

# Accept TCP packets on PORT 3000
iptables -A INPUT -p tcp --dport 3000 -j ACCEPT

# Save settings
/sbin/iptables-save

# List rules
iptables -L -v