This public IP you cannot put what you want, in this case it is your service provider (operator or ISP) that assigns you one, either statically or dynamically (the latter is the most normal).Īlso within the public IP we have two categories: The public IP is the identifier of our network facing the Internet, that is, the one that you have assigned in your home router in the Internet WAN interface. Regarding IPs, we could say that there are two classes: These addresses are represented in decimal notation separated by periods such as the address 192.168.1.1. In addition, an IP address in IPv4 networks is made up of four groups of numbers between 0 and 255 separated by dots, with a length of 32 bits. Differences between public IP and private IPĪn IP could be defined as a logical and unique identifier for each of the computers connected to a network. To perform a port scan to check the open ports on your router, you have to do it towards a specific type of IP, specifically the public IP that our operator provides us. To make them accessible from the outside, we will have to “open a port” in NAT, so that all the packets that reach the public IP and a specific port are correctly redirected to their recipient.īefore we start explaining how to check open ports on your router, let’s start by explaining the IP classes we have on a home network. As you may have noticed, LAN computers use private addressing that is not routable through the Internet. However, if communication starts on the Internet (WAN, external network) to the LAN, it is necessary to open a port to correctly redirect the packets to their destination. When a computer on the LAN (internal network) tries to access the Internet, NAT is in charge of translating addresses and making use of TCP / UDP ports without having to do anything, it is completely automatic and transparent to the user. Any other use that requires a connection from the Internet to your internal local network (PC, server, console, etc.).įinally, if you are going to use games on your console, it is recommended to open the DMZ to the consoles, because they usually use many different ports for each game that we are using.Īll home routers use NAT to go out to the Internet with multiple devices simultaneously, using the same public IP address.
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