Port mapping on Linux or Windows-Linux Operation and Maintenance-php.cn

Usually the server has many network cards, so it may be connected to different networks. In an isolated network, some services may Communication is required. At this time, the server can be configured to assume the function of forwarding data packets.

1. Implement port mapping under Windows

1. Query the port mapping situation

netsh interface portproxy show v4tov4

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2. Query the port mapping situation of a certain IP

netsh interface portproxy show v4tov4 | find "[IP]"例：netsh interface portproxy show v4tov4 | find "192.168.1.1"

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3. Add a port mapping

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

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4. Delete a port mapping

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

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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 MASQUERADE

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2. 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

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实验：将部署在内网的服务映射到外网

实验环境

VMWare Workstation Pro
5 台最小化安装的 centos 7 虚拟机

Experimental topology

Implement port mapping on Linux or Windows

##Internal network and External network is relative to Server4.
Server1 and Server2 are two servers in the intranet environment ;
Server3 is a server in an external network environment;
Server4 is a dual network card host, connected to 192.168.50.0/24 and 172.16.2.0 respectively /24Two networks.

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 8080

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Server2、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

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在client上访问Server2的资源

curl http://192.168.50.12:8080/index.htm

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在client上访问Server3的资源

curl http://172.16.2.11:8080/index.html

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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

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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

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在client上访问Server2的资源

curl http://172.16.2.100:8082/index.html

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在client上访问Server3的资源

curl http://172.16.2.11:8080/index.html

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如果`Server4`为 Windows，替换一下相应的命令即可

Windows 的 IP 信息如下

##Ethernet0192.168.50.105255.255.255.0-Internal network cardEthernet1172.16.2.105255.255.255.0-External network card

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

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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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