NAME
rdpd — router discovery protocol daemon (OBSOLETE)
DESCRIPTION
rdpd,
the router discover protocol daemon, implements the host portion
of the router discovery protocol (see
SEE ALSO).
More specifically
rdpd:
solicits router advertisements when it is first started so as to
populate the kernel table as soon as possible.
listens on all ethernet interfaces (that are up) for ICMP router
advertisement datagrams.
adds a default router to the kernel table based on whether the
router is a neighbor and has the highest preference among all
advertisements received.
ages the default router entry applied to the kernel table based
on the lifetime value found in the advertisement message.
rdpd
can be started during boot-time initialization. To do so, see
/etc/rc.config.d/netconf.
(But see
WARNINGS
below.)
Options
rdpd
supports the following options:
- -r
Display the version of
rdpd.
- -t
Enable tracing of the following events:
setting of expiration timer for advertised entry.
expiration of a router advertisement entry
(only the active entry has a timer running).
add/update of an advertised router to the kernel.
removal from kernel table of an advertised router.
reception of a router advertisement from the link.
transmission of a router solicitation message.
failure while attempting to transmit a solicitation.
- -v
Enable verbose tracing, which in addition to the above, traces:
contents of the router advertisement message
received.
contents of
rdpd
internal statics which includes:
- 1.
total number of
icmp
messages received,
- 2.
total number advertisements received,
- 3.
total number of advertisements with invalid
number of addresses field,
- 4.
total number of advertisements with invalid
address size field,
- 5.
total number of advertisements with invalid
message lengths,
- 6.
total number of advertisements with invalid
lifetime fields,
- 7.
total number of
icmp
messages with number of
bytes received <> header length field.
LIMITATIONS
- 1.
The maximum number of default routes retained is 10. Only one of
which is applied to the kernel routing tables (the one with the
highest preference). In the event that the advertised router with
the highest preference expires the retained advertised router list
will be searched for the highest preference, still current entry
and that entry will be applied to the kernel table. This allows
for quick recovery from aged advertisements.
- 2.
rdpd
only becomes aware of link state changes when either a new
Router Advertisement message is received or a timer pops to age a
currently active default router added by
rdpd.
This may cause
a delay between an interface state change (e.g.,
ifconfig
down)
and any necessary change to the kernel routing table.
- 3.
The "all hosts on subnet" broadcast address is used for sending
solicitations instead of either the all-routers multicast or
limited-broadcast IP addresses.
- 4.
The limited-broadcast address for inbound Advertisements is
assumed.
- 5.
Default routers added via the
route
command can be altered due
to Router Advertisements for the same router.
- 6.
Adding default routes via the
route
command can cause
unpredictable results and should be avoided.
OBSOLESCENCE
The functionality of
rdpd
has been subsumed in
gated.
See the
routerdiscovery
statements described in
gated.conf(4).
rdpd
has been obsoleted in HP-UX 11i Version 2.
WARNINGS
rdpd
should not be used if
routerdiscovery client
is enabled when running
gated.
AUTHOR
rdpd
was developed by HP.
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