好久没弄了，来个最简的centos下的Iptables文件存照吧。

有最基本的作用。。

# Generated by iptables-save v1. ::
*filter
:INPUT ACCEPT [:]
:FORWARD ACCEPT [:]
:OUTPUT ACCEPT [:]
-A INPUT -i lo -j ACCEPT
-A INPUT -p tcp -m tcp --dport  -j ACCEPT
-A INPUT -p tcp -m tcp --dport  -j ACCEPT
-A INPUT -p tcp -m tcp --dport  -j ACCEPT
-A INPUT -p icmp -m icmp --icmp-type  -j ACCEPT
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A FORWARD -p tcp --syn -m limit --limit /s --limit-burst  -j ACCEPT
-A FORWARD -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK RST -m limit --limit /sec -j ACCEPT
-A FORWARD -p icmp -m icmp --icmp-type  -m limit --limit /sec -j ACCEPT
-A INPUT -j REJECT --reject-with icmp-host-prohibited
-A FORWARD -j REJECT --reject-with icmp-host-prohibited
COMMIT
# Completed on Wed Sep   ::