Installing and Administering Internet Services

322 Chapter8
Configuring gated
Overview
exchanging routing information via a common routing protocol.
• gated gives the system administrator flexibility in setting up and
controlling network routing. For example, gated can listen to
network traffic at specified routers, determine available routes, and
update local routing tables accordingly.
When to Use gated
gated is most often used in large networks, or small networks connected
to larger wide-area networks.
gated should be run on routers (gateways) so its routing information can
be sent to other routers. gated supports many routing protocols that
allow routers to build and maintain dynamic routing tables and also
RDP as a client with a replacement for rdpd. However, gated also
supports RIP (Routing Information Protocol), which can run on end
systems (systems with only one network interface) as well as routers.
NOTE gated also supports RDP as a client. RDP will replace rdpd.
gated is useful in topologies with multiple routers and multiple paths
between parts of the network. gated allows the routers to exchange
routing information and dynamically change routing information to
reflect topology changes and maintain optimal routing paths.
Alternatively, you may configure IP routes manually with the route (1M)
command. For end systems in subnets with only one router (gateway) to
the rest of the internet, manually configuring a default route is usually
more efficient than running gated. Type man 1M route at the HP-UX
prompt.
When connected to wide-area networks, gated can be used to inject local
routing information into the wide-area network’s routing table.
Protocols
For routing purposes, networks and gateways are logically grouped into
autonomous systems. An autonomous system (AS) is a set of networks
and gateways that is administered by a single entity. Companies and
organizations that wish to connect to the Internet and form an AS must
obtain a unique AS number from the Internet Assigned Numbers