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<p><FONT class=normalfont><B><font color=blue>怎么用iptable完成端口映射</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>我有一外网IP:218.17.xxx.xxx,现在想用这个IP通过linux映射到内部的一台WEB服务器上IP为:192.168.188.5,就是不管在外面还是内部都是用218.17.xxx.xxx来访问WEB(这WEB在内部的192.168.188.5上),怎么做?<br>
<br>
Q:一局域网192.168.1.0/24,有web和ftp服务器192.168.1.10、192.168.1.11,网关linux,内网eth0,IP为192.168.1.1,外网eth1,IP为a.b.c.d,怎样作NAT能使内外网都能访问公司的服务器?<br>
A:# web<br>
# 用DNAT作端口映射<br>
iptables -t nat -A PREROUTING -d a.b.c.d -p tcp --dport 80 -j DNAT --to 192.168.1.10<br>
# 用SNAT作源地址转换(关键),以使回应包能正确返回<br>
iptables -t nat -A POSTROUTING -d 192.168.1.10 -p tcp --dport 80 -j SNAT --to 192.168.1.1<br>
# 一些人经常忘了打开FORWARD链的相关端口,特此增加<br>
iptables -A FORWARD -o eth0 -d 192.168.1.10 -p tcp --dport 80 -j ACCEPT<br>
iptables -A FORWARD -i eth0 -s 192.168.1.10 -p tcp --sport 80 -m --state ESTABLISHED -j ACCEPT<br>
<br>
# ftp<br>
modprobe ip_nat_ftp ###加载ip_nat_ftp模块(若没有编译进内核),以使ftp能被正确NAT<br>
modprobe ip_conntrack_ftp ###加载ip_conntrack_ftp模块<br>
# 用DNAT作端口映射<br>
iptables -t nat -A PREROUTING -d a.b.c.d -p tcp --dport 21 -j DNAT --to 192.168.1.11<br>
iptables -A FORWARD -o eth0 -d 192.168.1.11 -p tcp --dport 21 -j ACCEPT<br>
iptables -A FORWARD -i eth0 -s 192.168.1.11 -p tcp --sport 21 -m --state ESTABLISHED -j ACCEPT<br>
iptables -A FORWARD -i eth0 -s 192.168.1.11 -p tcp --sport 20 -m --state ESTABLISHED,RELATED -j ACCEPT<br>
iptables -A FORWARD -o eth0 -d 192.168.1.11 -p tcp --dport 20 -m --state ESTABLISHED -j ACCEPT<br>
iptables -A FORWARD -o eth0 -d 192.168.1.11 -p tcp --dport 1024: -m --state ESTABLISHED,RELATED -j ACCEPT<br>
iptables -A FORWARD -i eth0 -s 192.168.1.11 -p tcp --sport 1024: -m --state ESTABLISHED -j ACCEPT<br>
# 用SNAT作源地址转换(关键),以使回应包能正确返回<br>
iptables -t nat -A POSTROUTING -d 192.168.1.11 -p tcp --dport 21 -i eth0 -j SNAT --to 192.168.1.1 <br>
<br>
Q:网络环境如上一问题,还在网关上用squid进行透明代理,也作了SNAT了,为什么内网还是不能访问公司的web服务器?iptables如下:<br>
iptables -t nat -A PREROUTING -s 192.168.1.0/24 -p tcp --dport 80 -i eth0 -j REDIRECT --to 3128<br>
iptables -t nat -A PREROUTING -d a.b.c.d -p tcp --dport 80 -j DNAT --to 192.168.1.10<br>
iptables -t nat -A POSTROUTING -d 192.168.1.10 -p tcp --dport 80 -j SNAT --to 192.168.1.1<br>
A:问题主要在PREROUTING链中REDIRECT和DNAT的顺序,由于先进行了REDIRECT(重定向),则到第二句DNAT时,端口已变为3128,不匹配第二句的目的端口80,DNAT也就不会执行,不能到达正确的目的地。解决的办法有两个:<br>
1、把REDIRECT语句放到DNAT语句的后面,如下:<br>
iptables -t nat -A PREROUTING -d a.b.c.d -p tcp --dport 80 -j DNAT --to 192.168.1.10<br>
iptables -t nat -A PREROUTING -s 192.168.1.0/24 -p tcp --dport 80 -i eth0 -j REDIRECT --to 3128<br>
2、在REDIRECT语句中增加匹配目的地址"-d ! a.b.c.d",如下:<br>
iptables -t nat -A PREROUTING -s 192.168.1.0/24 -d ! a.b.c.d -p tcp --dport 80 -i eth0 -j REDIRECT --to 3128<br>
<br>
//转自http://www.linuxaid.com.cn/forum/showdoc.jsp?l=1&i=57988<br>
<br>
 mb 回复于:2003-09-18 11:40:12<br>
iptables -t nat -A PREROUTING -d 218.17.xxx.xxx  -p tcp --dprot 80 -j DNAT --to  192.168.188.5:80<br>
<br>
 cgweb 回复于:2003-09-18 12:57:54<br>
精华!!<br>
<br>
 ccf 回复于:2003-09-18 14:04:09<br>
收藏<br>
<br>
 lnx 回复于:2003-09-18 14:39:41<br>
现在搞定了,非常感谢"江湖无赖"和"MB",尤其是"江湖无赖"贴的东西非常不错.<br>
<br>
现在我有一个疑问就是:如果我的WEB服务器的访问人数非常的多的话(并发时可能会有5000左右),不知会有没有什么影响呢?我第一次打开时感觉到比原来直接用外IP时要慢.另外,如果我用域名来访问应该可以吧?(注:测试时用的是另一外IP,没有域名的,暂时没有接上真正的WEB来测试)<br>
<br>
 kenywei 回复于:2003-10-29 15:47:09<br>
 <br>
我是新手,照着大虾说的配置就可以了吗?<br>
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