原文：http://bash.cyberciti.biz/security/shell-script-to-stop-linux-firewall/
一些Linux桌面版本(如 Debian)没有 /etc/init.d/iptables 脚本,因此可以采用下面shell脚本。
以下是该shell脚本的源代码：
#!/bin/bash
# Linux Firewall: Simple Shell Script To Stop and Flush All Iptables Rules
# Some Linux distros like Debian do not have /etc/init.d/iptables stop script
# This can be also called from cron job if you are testing new firewall on
# remote box to avoid lock out
# -------------------------------------------------------------------------
# Copyright (c) 2004 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
iptables -P INPUT ACCEPT
iptables -P OUTPUT ACCEPT
iptables -P FORWARD ACCEPT |