You may also want to implement subnetworks or serial line
gateways as described in
Chapter 3, ``Administering TCP/IP''.
Subnetworks provide a mechanism that enables several local
networks to appear as a single Internet network to off-site
hosts. Subnetworks are useful because they allow a site to hide
the local topology, requiring only a single route in external
gateways. Other benefits include:
overcoming distance limitations in cabling media.
connecting physically dissimilar networks (for example, Ethernet
and Token-Ring).
simplifying network administration and troubleshooting in large
networks.
connecting groups of users to reflect organizational structure.
You can configure a machine to serve as a gateway between a
SLIP network and an Ethernet network; the same
procedure can be used for PPP/Ethernet,
SLIP/Token-Ring, and PPP/Token-Ring gateways.
This procedure entails:
configuring the serial interface with a unique IP address.
configuring the Ethernet or Token-Ring card with a unique
IP address.
adding entries to the /etc/hosts file for the new
hostname and network addresses.