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Configuring gated
Configuring RDP
Chapter 3 87
Configuring RDP
You can use Router Discovery Protocol (RDP), a standard protocol, to
inform hosts of the presence of routers to which they can send packets.
You can also use RDP instead of host wiretapping routing protocols (for
example, RIP). It is used instead of, or in addition to, having statically
configured default routes in hosts.
RDP consists of two portions: the server portion, which runs on routers,
and the client portion, which runs on hosts. gated treats these portions
as separate protocols; therefore, you can enable only one of them at a
time. These portions are described in detail in the subsequent sections.
For a description of the RDP configuration statements, type man 4
gated.conf at the HP-UX prompt.
RDP Server
The RDP server runs on routers, and announces the routers’ existence to
hosts periodically by multicasting or broadcasting a router
advertisement. The advertisement is sent over an RDP server enabled
physical interface. Each router advertisement contains a list of all
addresses on a physical interface and their preference for being used as a
default router. You can configure the length of time (the lifetime) for
which addresses must remain on the list.
At first, router advertisements occur every few seconds, and then, they
start occurring few minutes. You can configure the minimum and
maximum intervals for router advertisements to occur. Also, a host can
send a router solicitation, requesting an advertisement. The router
responds with a unicast router advertisement unless a multicast or
broadcast advertisement is due to occur.
On hosts that support IP multicasting, router advertisements are sent by
default to the all-hosts mulicast address 224.0.0.1. You can also
configuration RDP to use broadcasting to send router advertisements.
This is useful when a particular host does not support IP multicasting, or
when one or more hosts on an attached network do not support IP
multicasting. If router advertisements are sent to the all-hosts multicast
address, or if an interface is configured for the limited-broadcast address
255.255.255.255, the advertisements contain all the IP addresses