Linux、Windows 上还不会端口映射的网工，请低调看过来！
转自：网络工程师阿龙
一、Windows下实现端口映射
netsh interface portproxy show v4tov4
netsh interface portproxy show v4tov4 | find "[IP]"例：netsh interface portproxy show v4tov4 | find "192.168.1.1"
netsh interface portproxy add v4tov4 listenaddress=[外网IP] listenport=[外网端口] connectaddress=[内网IP] connectport=[内网端口]例：netsh interface portproxy add v4tov4 listenaddress=2.2.2.2 listenport=8080 connectaddress=192.168.1.50 connectport=80
netsh interface portproxy delete v4tov4 listenaddress=[外网IP] listenport=[外网端口]例：netsh interface portproxy delete v4tov4 listenaddress=2.2.2.2 listenport=8080
二、Linux下端口映射
echo 1 >/proc/sys/net/ipv4/ip_forwardiptables -t nat -A POSTROUTING -j MASQUERADEiptables -A FORWARD -i [内网网卡名称] -j ACCEPTiptables -t nat -A POSTROUTING -s [内网网段] -o [外网网卡名称] -j MASQUERADE例：echo 1 >/proc/sys/net/ipv4/ip_forwardiptables -t nat -A POSTROUTING -j MASQUERADEiptables -A FORWARD -i ens33 -j ACCEPTiptables -t nat -A POSTROUTING -s 192.168.50.0/24 -o ens37 -j MASQUERADE
iptables -t nat -A PREROUTING -p tcp -m tcp --dport [外网端口] -j DNAT --to-destination [内网地址]:[内网端口]例：iptables -t nat -A PREROUTING -p tcp -m tcp --dport 6080 -j DNAT --to-destination 10.0.0.100:6090
实验环境
VMWare Workstation Pro 5台最小化安装的centos 7虚拟机
实验拓扑
Server4来说的。Server1和Server2为内网环境的两台服务器；Server3为外网环境下的一台服务器；Server4为一台双网卡主机，分别连接192.168.50.0/24和172.16.2.0/24两个网络。配置实验环境
1. Server1,2,3上搭建HTTP服务
Server1上搭建一个简单的HTTP服务cd ~echo "server1" > index.htmlpython -m SimpleHTTPServer 8080Server2、Server3同理对照实验
client上访问Server1的资源curl http://192.168.50.11:8080/index.htmlclient上访问Server2的资源curl http://192.168.50.12:8080/index.htmclient上访问Server3的资源curl http://172.16.2.11:8080/index.htmlclient是无法访问内网Server1,Server2的资源的。在Server4上配置端口映射
#允许数据包转发echo 1 >/proc/sys/net/ipv4/ip_forwardiptables -t nat -A POSTROUTING -j MASQUERADEiptables -A FORWARD -i ens33 -j ACCEPTiptables -t nat -A POSTROUTING -s 192.168.50.0/24 -o ens37 -j MASQUERADE#设置端口映射iptables -t nat -A PREROUTING -p tcp -m tcp --dport 8081 -j DNAT --to-destination 192.168.50.11:8080iptables -t nat -A PREROUTING -p tcp -m tcp --dport 8082 -j DNAT --to-destination 192.168.50.12:8080
/etc/rc.local文件。检查效果
client上访问Server1的资源curl http://172.16.2.100:8081/index.htmlclient上访问Server2的资源curl http://172.16.2.100:8082/index.htmlclient上访问Server3的资源curl http://172.16.2.11:8080/index.html如果Server4为Windows，替换一下相应的命令即可
netsh interface portproxy add v4tov4 listenaddress=172.16.2.105 listenport=8081 connectaddress=192.168.50.11 connectport=8080netsh interface portproxy add v4tov4 listenaddress=172.16.2.105 listenport=8082 connectaddress=192.168.50.12 connectport=8080netsh interface portproxy show v4tov4
检查效果
在client节点上
curl http://172.16.2.105:8081/index.htmlcurl http://172.16.2.105:8082/index.htmlcurl http://172.16.2.11:8080/index.html
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