For example, if you have a home network with several computers behind a router, then actually, to the rest of the internet, it will appear as if there is just one computer (the router) attached to the internet. Actually, it is more complicated than that. However, if you can work out the real address of your computer, and change (and if you update Now, the oversimplification in the above is the bit 'Every computer on the internet has a unique* IP address'. So, if you are accessing your Moodle site with a URL like it will only ever work on your own computer. And in the DNS system, localhost is always an alias for 127.0.0.1. No matter which computer you are on, 127.0.0.1 means 'this computer'. Now as well as every computer having a real address like 74.52.44.50, the IP address standard defines some magic addresses, of which 127.0.0.1 is the most useful. That is simply a lookup service, so you can ask for instead of having to remember things like. Now typing numbers all the time is a pain in the neck, which is why we have the domain name system (DNS). Similarly, your computer will have an IP address, which the server will use to send the data you ask for back to you. To get data from, your computer needs to connect to that address. 3 MACs, NATs, IPs, routers, DHCP, DNS and the internetĮvery computer on the internet has a unique IP address, which is a string of 4 numbers.2 Capacity of a home server or small office intranet.
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