Here, a local port is forwarded to a remote host. By default, all of your router’s ports should be closed. Only the ports your router uses are kept open, meaning traffic directed to the wrong port will be automatically blocked by the router’s firewall. For instance, websites use ports 80 and 443, and email uses port 25. Generally, ports are assigned to specific types of activity. Most routers can have up to 65,000 ports, but only around 1,000 are regularly used. You can think of ports as the routes in and out of your local network through your router. For example, it is also possible to use a piece of software called UPnP (Universal Plug and Play) to weaken your NAT type, or to use a Windows 10 Hotspot, which creates a moderate NAT type. There are other ways to bypass or change your NAT type, but port forwarding is the most popular. Port forwarding allows you to get around the limits imposed by the NAT firewall, improving the speed of some applications and making other services possible, including remote desktop access. It allows computers outside of your local network to access specific devices within your local area network (LAN). Port forwarding refers to the process manually opening and assigning a port to certain kinds of network traffic. These ports route external traffic to individual devices on your local network, and vice versa. This problem is solved by opening router ports. This can affect your ability to seed torrents and participate in multiplayer games, amongst other things. A strict NAT type has security benefits, but it can also make it harder for external devices to communicate with specific devices on your network, especially on peer-to-peer connections.
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