陆、应用实例
#!/bin/sh
#
# 石牌国小防火墙设定指令稿
# 2002/8/27
# 设定者:李忠宪(修改自 iptables tutorial 1.1.11 by Oskar Andreasson )
# 原文件是依 DMZ 需求设计,已根据校园 NAT 网络之需求修改,其余改动部份包括:
# 新增通讯协议定义区块
# 新增执行时,自动清除已设定之规则
# 支援 FTP
# 修改所有规则,改采 multiport 方式以简化规则
# 原文件仅支持 IP 伪装(多对一对应),已扩充为支持一对一对应及多对多对应
# 原文件仅支援 DNS 及 WEB,新增 ftp、mail、wam、PCAnywhere、ssh......等多种服务器
# 修改若干规则设定上的小错误
#
# Copyright (C) 2001 Oskar Andreasson <bluefluxATkoffeinDOTnet>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program or from the site that you downloaded it
# from; if not, write to the Free Software Foundation, Inc., 59 Temple
# Place, Suite 330, Boston, MA 02111-1307 USA
#
###########################################################################
#
# 1. Configuration options.
#
# 1.0 Protocols Configuration.
# 定义会用到的通讯协议
HTTP="80"
HTTPS="443"
FTP="21"
FTP_DATA="20"
SMTP="25"
POP3="110"
IMAP="143"
SSH="22"
TELNET="23"
PCAW_TCP="5631"
PCAW_UDP="5632"
WEBMIN="10000"