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<p><FONT class=normalfont><B><font color=blue>有关用linux作NAT服务(代理，透明代理等)</font></B></FONT><BR><FONT class=smallfont color=#ff9900>2004-04-23 15:18 pm</FONT><BR><FONT class=normalfont>作者：作者<br>来自：Linux知识宝库<br>联系方式：无名<br><br>一、准备工作： <br>
<br>
1.一台 Redhat linux主机（这是必备的）,分别在redhat linux 7.1以后的任何一版本上都<br>
测试没有问题<br>
<br>
2.两块网卡：eth0 eth1<br>
<br>
3.系统支持iptables:<br>
<br>
[root@NetShare linux-2.4]# rpm -qa|grep iptables<br>
iptables-1.2.5-3<br>
iptables-ipv6-1.2.5-3<br>
<br>
iptables的rpm包已经安装上了，不过还要看一下内核的支持情况，也决定了iptables所<br>
能发挥的功效<br>
<br>
4.内核情况如下：<br>
[root@NetShare linux-2.4]# cd /usr/src/linux-2.4<br>
[root@NetShare linux-2.4]# make menuconfig<br>
<br>
在 Networking options ---> 这个选项里有<br>
IP: Netfilter Configuration ---> （以下是偶的选择，供参考）<br>
<br>
<*> Connection tracking (required for masq/NAT) <br>
<M> FTP protocol support <br>
<M> IRC protocol support <br>
<M> Userspace queueing via NETLINK (EXPERIMENTAL) <br>
<*> IP tables support (required for filtering/masq/NAT) <br>
<M> limit match support <br>
<M> MAC address match support <br>
<M> netfilter MARK match support <br>
<M> Multiple port match support <br>
<M> TOS match support <br>
<M> AH/ESP match support <br>
<M> LENGTH match support <br>
<M> TTL match support <br>
<M> tcpmss match support <br>
<M> Connection state match support <br>
<M> Unclean match support (EXPERIMENTAL) <br>
<M> Owner match support (EXPERIMENTAL) <br>
<*> Packet filtering <br>
<M> REJECT target support <br>
<M> MIRROR target support (EXPERIMENTAL) <br>
<*> Full NAT <br>
<M> MASQUERADE target support <br>
<M> REDIRECT target support <br>
<M> Basic SNMP-ALG support (EXPERIMENTAL) <br>
<*> Packet mangling <br>
<M> TOS target support <br>
<M> MARK target support <br>
<M> LOG target support <br>
<M> ULOG target support <br>
<M> TCPMSS target support <br>
<br>
这是内核所支持的一些模块，相关模块都是作什么的，可以去参考内核的说明文档！<br>
<br>
<br>
二、具体实施：<br>
<br>
针对于此，我这几天写了一个简单的小脚本，大家可以利用他来作代理服务，如果有能力，可<br>
以添加一些相关的规则...<br>
<br>
<br>
程序如下：<br>
<br>
#! /bin/sh<br>
##### written by wind521 2002/12/17 #####<br>
##### mail: wbff0926@sina.com #####<br>
<br>
IPTABLES=/usr/sbin/iptables<br>
EXTERNAL="eth1" ---> 外网的接口<br>
INTERNAL="eth0" ---> 内网的接口<br>
IP=192.168.0.0/24 ---> 内网地址<br>
<br>
<br>
#<br>
### 重置三条链默认的规则<br>
#<br>
$IPTABLES -P INPUT ACCEPT<br>
$IPTABLES -P FORWARD ACCEPT<br>
$IPTABLES -P OUTPUT ACCEPT<br>
<br>
#<br>
### 重置nat表<br>
#<br>
$IPTABLES -t nat -P PREROUTING ACCEPT<br>
$IPTABLES -t nat -P POSTROUTING ACCEPT<br>
$IPTABLES -t nat -P OUTPUT ACCEPT<br>
<br>
#<br>
### 刷新nat与链的所有规则<br>
#<br>
$IPTABLES -F<br>
$IPTABLES -t nat -F<br>
<br>
#<br>
### 删除非默认的链和nat表的规则<br>
#<br>
$IPTABLES -X<br>
$IPTABLES -t nat -X<br>
<br>
start() {<br>
#<br>
###打开ip转发<br>
#<br>
echo -n $"Starting firewall "<br>
echo 1 > /proc/sys/net/ipv4/ip_forward<br>
<br>
#<br>
###加载必要的模块<br>
#<br>
echo -n "Staring modprobe the necessary mod for iptables"<br>
for i in /lib/modules/`uname -r`/kernel/net/ipv4/netfilter/*<br>
do<br>
t=`echo $i |sed 's/.o$//g'`<br>
module=`basename $t`<br>
modprobe $module<br>
done<br>
<br>
#<br>
###允许ICMP数据包(ping)<br>
#<br>
$IPTABLES -A INPUT -p icmp -j ACCEPT<br>
<br>
#<br>
###允许内部网之间的数据通讯<br>
#<br>
$IPTABLES -A INPUT -i $INTERNAL -s $PRINET -j ACCEPT<br>
$IPTABLES -A OUTPUT -o $INTERNAL -d $PRINET -j ACCEPT<br>
<br>
#<br>
###NAT转发的关键<br>
#<br>
$IPTABLES -t nat -A POSTROUTING -o $EXTERNAL -j MASQUERADE<br>
echo_success<br>
}<br>
<br>
<br>
stop(){<br>
echo -n $"Stopping Firewall"<br>
<br>
flush<br>
<br>
for i in /lib/modules/`uname -r`/kernel/net/ipv4/netfilter/*<br>
do<br>
t=`echo $i |sed 's/.o$//g'`<br>
module=`basename $t`<br>
modprobe -r $module<br>
done<br>
<br>
# Disale IPV4 Packet Forwarding<br>
echo "0" > /proc/sys/net/ipv4/ip_forward<br>
echo_success<br>
}<br>
<br>
restart()<br>
{<br>
stop<br>
start<br>
}<br>
<br>
# See how we were called.<br>
case "$1" in<br>
start)<br>
start<br>
;;<br>
stop)<br>
stop<br>
;;<br>
restart)<br>
restart<br>
;;<br>
*)<br>
echo $"Usage: $0 {start|stop|restart}"<br>
exit 1<br>
esac<br>
<br>
按照需要将你所对应的变量改动一下，应该没有问题的！<br>
<br>
说明：这个基本上能保证代理上网的功能，其他的什么都没有作，包括SNAT，DNAT，都没有作，<br>
如果有需要的可以自己去改动,如有问题，请与偶mail联系！
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