一個簡單的iptables腳本

前幾天寫了一個很簡單的iptables腳本，貼出來，時常溫習一下語法結構：

#!/bin/bash
#
iptables -F
iptables -Z
iptables -X

iptables -F -t nat
iptables -X -t nat
iptables -Z -t nat

# For lookback
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

#For APP Server
iptables -A INPUT -p tcp -m multiport --port 80,443,21099 -j ACCEPT
iptables -A INPUT -p udp --dport 21099 -j ACCEPT

#For SSH
iptables -A INPUT -p tcp -s 192.168.0.0/16 --dport 22 -j ACCEPT
iptables -A INPUT -p tcp -s 10.10.0.0/16 --dport 22 -j ACCEPT

# For ping
iptables -A OUTPUT -p icmp -j ACCEPT
iptables -A INPUT -p icmp -j ACCEPT

# For default
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT
iptables -t nat -P PREROUTING ACCEPT
iptables -t nat -P POSTROUTING ACCEPT
iptables -t nat -P OUTPUT ACCEPT
iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT