通常服务器会有许多块网卡，因此也可能会连接到不同的网络，在隔离的网络中，某些服务可能会需要进行通信，此时服务器经过配置就可以承担起了转发数据包的功能。一、Windows下实现端口映射1. 查询端口映射情况netsh interface portproxy show v4tov42. 查询某一个IP的所有端口映射情况netsh interface portproxy show v4tov4 | find "[IP]"例：netsh interface portproxy show v4tov4 | find "192.168.1.1"3. 增加一个端口映射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=804. 删除一个端口映射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1. 允许数据包转发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 MASQUERADE2. 设置端口映射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：将部署在内网的服务映射到外网实验环境VMWare Workstation Pro5台最小化安装的centos 7虚拟机实验拓扑内网和外网是相对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服务用Python在Server1上搭建一个简单的HTTP服务cd ~echo "server1" > index.htmlpython -m SimpleHTTPServer 8080Server2、Server3同理对照实验在client上访问Server1的资源curl http://192.168.50.11:8080/index.html在client上访问Server2的资源curl http://192.168.50.12:8080/index.htm在client上访问Server3的资源curl http://172.16.2.11:8080/index.html可以看到，外网的client是无法访问内网Server1,Server2的资源的。在Server4上配置端口映射临时配置#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永久配置如果需要永久配置，则将以上命令追加到/etc/rc.local文件。检查效果在client上访问Server1的资源curl http://172.16.2.100:8081/index.html
在client上访问Server2的资源curl http://172.16.2.100:8082/index.html在client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Windows的IP信息如下网卡IP地址子网掩码默认网关备注Ethernet0192.168.50.105255.255.255.0-内网网卡Ethernet1172.16.2.105255.255.255.0-外网网卡配置并查看端口映射情况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
本文出自快速备案，转载时请注明出处及相应链接。