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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>.

[[File:Ieie.png|600px]]

[[File:Ieie.png|600px]]

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>.

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==