The mapping is that your computer is an internal network IP. If your computer has a FTP server, the port of the FTP server is 21. If the computer on the external network is to access port 21 of your computer FTP server, you need to do it on the router at this time Port mapping, others can access your 21 ports after mapping. Map method: Taking the TP-Link router as an example, the methods are the same. After the landing router is successful, select the forwarding rules-virtual server, setting method: service side number 21, IP address 192.168.1.16 (your computer's IP address), protocol ALL, the state can take effect. Hope my answer is helpful to you!
The mapping is that your computer is an internal network IP. If your computer has a FTP server, the port of the FTP server is 21. If the computer on the external network is to access port 21 of your computer FTP server, you need to do it on the router at this time Port mapping, others can access your 21 ports after mapping. Map method: Taking the TP-Link router as an example, the methods are the same. After the landing router is successful, select the forwarding rules-virtual server, setting method: service side number 21, IP address 192.168.1.16 (your computer's IP address), protocol ALL, the state can take effect. Hope my answer is helpful to you!