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 rdpd(1M)							    rdpd(1M)




 NAME
      rdpd - router discovery protocol daemon (OBSOLESCENT)

 SYNOPSIS
      rdpd [-r | -t | -v]

 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:




 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000






 rdpd(1M)							    rdpd(1M)




			     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).  Consequently,
      rdpd may be obsoleted in a future release of HP-UX.

 WARNINGS
      rdpd should not be used if routerdiscovery client is enabled when
      running gated.





 Hewlett-Packard Company	    - 2 -   HP-UX Release 11i: November 2000






 rdpd(1M)							    rdpd(1M)




 AUTHOR
      rdpd was developed by HP.

 SEE ALSO
      gated(1m), gated.conf(4).

      [1] Deering, S., "ICMP Router Discovery Messages", RFC 1256















































 Hewlett-Packard Company	    - 3 -   HP-UX Release 11i: November 2000