Routing allows traffic from your local network to reach its
    destination elsewhere on the internet. All hosts and gateways
    on a network use routing protocols to exchange and store routing
    information. Routing is simply the act of forwarding datagrams
    based on information stored in a routing table.

    The TCP/IP Services product provides two types of routing:

    o  Static

       Because static routing requires manual configuration, it is
       most useful when the number of gateways is limited and where
       routes do not change frequently.

    o  Dynamic

       Dynamic routing tables use information received by means of
       routing protocol updates; when routes change, the routing
       protocol provides information on the changes. Routing daemons
       implement a routing policy, that is, the set of rules that
       decide which routes go in to the routing table. A routing
       daemon writes routing messages to a routing socket causing the
       kernel to add a new route, delete an existing route, or modify
       an existing route.

       The kernel also generates routing messages that can be read by
       any routing socket when events occur that might be of interest
       to the process; for example, when the interface has gone down
       or a redirect has been received.

       TCP/IP Services implements two routing daemons: the Routing
       Daemon (ROUTED) and the Gateway Routing Daemon (GATED).