Although it keeps you secure, a NAT firewall can also block incoming connections you want. Some VPN services use a NAT firewall to protect customers from malicious internet connections. A popular VPN port forwarding use is bypassing the NAT firewall.The VPN will be an interface between your computer and the internet without allowing you to connect to the internet directly. VPN port forwarding is similar to the above process.That’s why this process is called port forwarding. This port is also considered when your computer receives data from the internet. The port number is added to the end of the device’s IP to send and receive data.(A popular port is 443 for HTTPS traffic.) Each one has an identification number called a port. Your computer receives this data for certain processes or functions.The router fetches the data from the internet and forwards that data to the local device. Your computer has to communicate through the router when connecting to the internet.Your computer, connected to the router, has a private IP address that can’t be used to connect to the internet.When you connect to the internet, you use a public IP given by an ISP to the router.And when do you need it? When you need to allow incoming connections from a WAN (internet) to reach a specific device/port on a LAN (a private network). What is port forwarding? In simple terms, it’s forwarding internet data from one port to another.
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