As I explained to you earlier, the internal IP address allows the router to recognize the device to which the data must go. Now that you know why you have to open NAT, the time has come to specify the role of doors in all this. Opening NAT, or opening ports or still port forwarding, means just that: allowing external users to connect to your device.
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In some particular cases, for example to host gaming sessions or to download at most bandwidth from programs like eMule or uTorrent, it is the device connected to the router that has to work as a server, and therefore it becomes essential to accept incoming connections on certain ports listening (changing from program to program): by default, this behavior is blocked in order to preserve the security of the entire network and device. This result is obtained thanks to the particular “graphs” that the router creates by itself, called in routing routing tables, able to independently sort the data, both incoming and outgoing, to the various devices connected to the network (computer, smartphone, tablet, etc.): these are “recognized” thanks to their internal IP address.Īt this point, however, it is right to make a clarification: in a “normal” scenario, are devices connected to the network to request the servers to receive data (mail server for emails, Web server for surfing the Internet, and so Street) consequently, the NAT of the router is configured to “freely” pass the outgoing connections of the various devices, with the ability to send the answers to the right device, once received. NAT, or Network Address Translation (which you can translate into Italian with translation of network addresses), is the operation that allows the router to connect multiple devices to the Internet using only one external IP address. Before taking the keyboard and taking action on your router, it is good to give you some hints about what you are going to change.