Chapter 3 Network Configuration
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Routing
The routing table tells the NIC which router or gateway to use to
access other subnets or hosts. In most situations, you can simply
add your router's IP address as the default router. All packets
destined for other subnets will be forwarded to the default router for
delivery to the destination host. If you have more complex routing
requirements, add static routing entries for specific hosts or
networks in the remaining Routing rows. Packets with IP addresses
that match a given Destination and Mask (from the first two fields in
a Routing row) will be routed to the router/gateway named in the
third field. Packets which do not match any of the listed
Destinations and Masks will be routed to the default router if one is
set.