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A router or another Internet-capable machine will typically have two types of network interfaces: <i>internal</i> & <i>external</i>.

A router or another Internet-capable machine will typically have two types of network interfaces: <i>internal</i> & <i>external</i>.

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Any network interface must have an IP address in order to communicate inside or outside of the network.

Any network interface must have an IP address in order to communicate inside or outside of the network. There are two types of IP addresses (in terms of accessibility, uniqueness & naming conventions): <b>public</b> and <b>private</b>.  

==Public IP address==

==Public IP address==

An IP address is a number used to identify a host on an IP (Internet Protocol) network. In order to successfully communicate on the Internet or any other computer network, a machine must have a network interface and an IP address assigned to it that is unique to that network.

An <b>IP address</b> is a number used to identify a host on an IP (Internet Protocol) network. In order to successfully communicate on the Internet or any other computer network, a machine must have a network interface and an IP address assigned to it that is unique to that network.

A <b>public</b> IP address is an IP address that is unique to the entire Internet. Public IPs can be accessed globally; therefore, they are often used by publicly accessible entities such as websites, DNS and VPN servers, etc.

A <b>public</b> IP address is an IP address that is unique to the entire Internet. Public IPs can be accessed globally; therefore, they are often used by publicly accessible entities such as websites, DNS and VPN servers, etc.