HP-UX Reference (11i v3 07/02) - 4 File Formats (vol 8)

g
gated.conf(4) gated.conf(4)
The Router Discovery Server
The Router Discovery Server runs on routers and announces their existence to hosts. It does this by period-
ically multicasting or broadcasting a Router Advertisement to each interface on which it is enabled.
These Router Advertisements contain a list of all the routers addresses on a given interface and their
preference for use as a default router.
Initially these Router Advertisements occur every few seconds, then fall back to every few minutes. In
addition, a host may send a Router Solicitation to which the router will respond with a unicast Router
Advertisement (unless a multicast or broadcast advertisement is due momentarily).
Each Router Advertisement contains a Advertisement Lifetime field indicating for how long the advertised
addresses are valid. This lifetime is configured such that another Router Advertisement will be sent before
the lifetime has expired. A lifetime of zero is used to indicate that one or more addresses are no longer
valid.
On systems supporting IP multicasting, the Router Advertisements are by default send to the all-hosts mul-
ticast address 224.0.0.1. However, the use of broadcast may be specified. When Router Advertisements
are being sent to the all-hosts multicast address, or an interface is configured for the limited-broadcast
address 255.255.255.255, all IP addresses configured on the physical interface are included in the
Router Advertisement. When the Router advertisements are being sent to a net or subnet broadcast, only
the address associated with that net or subnet is included.
The Router Discovery Server Statement
routerdiscovery server yes | no | on | off [ {
traceoptions trace_options ;
interface interface_list
[ minadvinterval time ]
[ maxadvinterval time ]
[ lifetime time ]
;
address interface_list
[ advertise ]|[ignore ]
[ broadcast ]|[multicast ]
[ ineligible ]|[preference preference ]
;
} ] ;
traceoptions trace_options
Specifies the Router Discovery tracing options. (See Trace Statements and the Router Discovery
specific tracing options below.)
interface interface_list
Specifies the parameters that apply to physical interfaces. Note a slight difference in convention
from the rest of GateD, interface specifies just physical interfaces (such as le0, ef0 and en1),
while address specifies protocol (in this case IP) addresses.
Interface parameters are:
maxadvinterval time
The maximum time allowed between sending broadcast or multicast Router Advertise-
ments from the interface. Must be no less than 4 and no more than 30:00 (30 minutes
or 1800 seconds). The default is 10:00 (10 minutes or 600 seconds).
minadvinterval time
The minimum time allowed between sending unsolicited broadcast or multicast
Router Advertisements from the interface. Must be no less than 3 seconds and no
greater than maxadvinterval. The default is 0.75 * maxadvinterval.
lifetime time
The lifetime of addresses in a Router Advertisement. Must be no less than maxadvin-
terval and no greater than 2:30:00 (two hours, thirty minutes or 9000 seconds). The
default is 3 * maxadvinterval.
address interface_list
Specifies the parameters that apply to the specified set of addresses on this physical interfaces.
Note a slight difference in convention from the rest of GateD, interface specifies just physical
interfaces (such as le0, ef0 and en1), while address specifies protocol (in this case IP)
160 Hewlett-Packard Company − 33 − HP-UX 11i Version 3: February 2007