Difference between static and dynamic IPs. When a device is assigned a static IPaddress, it does not change. The device always has the same IP address. Most devices use dynamic IP addresses, which are assigned by the network when they connect. These IP addresses are temporary, and can change over time.
What Is A Static IP?
When we talk about IP addresses of home computers, we are usually referring to two types of address. One is your external IP address – the one that the world sees as your Internet connection. Then you have your private IP addresses internally on your home network. Even if you only have one computer on your home network, it will have a private IP given to it by the router. Private IP addresses cannot be routed over the Internet and are strictly for private use. There are a few possible ranges of private IP address, but for most home users this will be 192.168.*.*(where * can be anything).
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In order to set up a Web Server on your home network that is accessible by anyone in the world, you need to forward incoming requests on port 80 to your web servermachine. If the web server was to restart and get a new IP from the router, the special rule that you created to forward requests on port 80 to the old server IP address wouldn’t work anymore, and your server would break.
For some older routers and gaming setups, you needed to forward certain ports to your xBox or PC to play online multiplayer games. More recent routers include an automated setup procedure called uPNP which eliminates the need to set up rules by hand.