Contributed by Coranth Gryphon
<gryphon@healer.com>.
6 October 1995.
For one machine to be able to find another, there must be a mechanism in place to describe how to get from one to the other. This is called Routing. A ``route'' is a defined pair of addresses: a destination and a gateway. The pair indicates that if you are trying to get to this destination, send along through this gateway. There are three types of destinations: individual hosts, subnets, and ``default''. The ``default route'' is used if none of the other routes apply. We will talk a little bit more about default routes later on. There are also three types of gateways: individual hosts, interfaces (also called ``links''), and ethernet hardware addresses.