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RDISC(1M)							     RDISC(1M)

NAME    [Toc]    [Back]

     rdisc - Internet router discovery daemon

SYNOPSIS    [Toc]    [Back]

     /usr/etc/rdisc [ -sfa ]

     /usr/etc/rdisc -r [ -p preference ] [ -T interval ]

DESCRIPTION    [Toc]    [Back]

     rdisc implements the ICMP router discover protocol.  The first form of
     the command is used on hosts and the second form is used on routers.  On
     a host rdisc is invoked at	boot time to populate the network routing
     tables with default routes. On a router it	is also	invoked	at boot	time
     in	order to start advertising the router to all the hosts.

   Host	(First Form)
     On	a host rdisc listens on	the ALL_HOSTS ( multicast address
     for ROUTER_ADVERTISE messages from	routers. The received messages are
     handled by	first ignoring those listed router addresses with which	the
     host does not share a network.  Among the remaining addresses the ones
     with the highest preference are selected as default routers and a default
     route is entered in the kernel routing table for each one of them.

     Optionally, rdisc can avoid waiting for routers to	announce themselves by
     sending out a few ROUTER_SOLICITATION messages to the ALL_ROUTERS
     ( multicast address when	it is started.

     A timer is	associated with	each router address and	the address will no
     longer be considered for inclusion	in the routing tables if the timer
     expires before a new advertise message is received	from the router.  The
     address will also be excluded from	consideration if the host receives an
     advertise message with the	preference being maximally negative.

   Router (Second Form)    [Toc]    [Back]
     When rdisc	is started on a	router,	it uses	the SIOCGIFCONF	ioctl(2) to
     find the interfaces configured into the system and	it starts listening on
     the ALL_ROUTERS multicast address on all the interfaces that support
     multicast.	 It sends out advertise	messages to the	ALL_HOSTS multicast
     address advertising all its addresses.  A few initial advertise messages
     are sent out during the first 30 seconds and after	that it	will transmit
     advertise messages	approximately every 600	seconds.

     When rdisc	receives a solicitation	message	it sends an advertise message
     to	the host that sent the solicitation message.

     When rdisc	is terminated by a signal it sends out an advertise message
     with the preference being maximally negative.

									Page 1

RDISC(1M)							     RDISC(1M)

OPTIONS    [Toc]    [Back]

     -a		    Accept all routers independently of	the preference they
		    have in their advertise messages.  Normally	rdisc only
		    accepts (and enters	in the kernel routing tables) the
		    router or routers with the highest preference.

     -f		    Run	rdisc forever even if no routers are found.  Normally
		    rdisc gives	up if it has not received any advertise
		    message after soliciting three times, in which case	it
		    exits with a non-zero exit code.  If -f is not specified
		    in the first form then -s must be specified.

     -p	preference  Set	the preference transmitted in the solicitation
		    messages.  The default is zero.

     -r		    Act	as a router as opposed to a host.

     -s		    Send three solicitation messages initially to quickly
		    discover the routers when the system is booted.  When -s
		    is specified rdisc exits with a non-zero exit code if it
		    can	not find any routers.  This can	be overridden with the
		    -f option.

     -T	interval    Set	the interval between transmitting the advertise
		    messages.  The default time	is 600 seconds.

SEE ALSO    [Toc]    [Back]

     routed(1M)	ioctl(2), icmp(7), inet(7)

     Deering, S.E.,ed ``ICMP Router Discovery Messages,'' RFC 1256, Network
     Information Center, SRI International, Menlo Park,	Calif.,	September

									PPPPaaaaggggeeee 2222
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