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RDISC(8)	       System Manager's Manual: iputils		      RDISC(8)

NAME
       rdisc - network router discovery daemon

SYNOPSIS
       rdisc  [-abdfrstvV]  [-p	 preference]  [-T max_interval] [send_address]
       [receive_address]

DESCRIPTION
       rdisc implements client side of	the  ICMP  router  discover  protocol.
       rdisc  is  invoked  at boot time to populate the network routing tables
       with default routes.

       rdisc listens  on  the  ALL_HOSTS  (224.0.0.1)  multicast  address  (or
       receive_address	provided  it  is  given) 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 ker‐
       nel 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
       (224.0.0.2) multicast address (or send_address provided	it  is	given)
       when it is started.

       A  timer is associated with each router address and the address will no
       longer be considered for inclusion in the 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.

       Server side of router discovery protocol is supported by Cisco IOS  and
       by any more or less complete UNIX routing daemon, f.e gated.  Or, rdisc
       can act as responder, if compiled with -DRDISC_SERVER.

OPTIONS
       -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.

       -b     Opposite	to  -a, i.e. install only router with the best prefer‐
	      ence value. It is default behaviour.

       -d     Send debugging messages to syslog.

       -f     Run rdisc forever even if no routers are found.  Normally	 rdisc
	      gives  up	 if  it	 has  not received any advertise message after
	      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.

       -r     Responder mode, available only if compiled with -DRDISC_SERVER.

       -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.

       -p preference
	      Set preference in advertisement.	Available only with -r option.

       -T max_interval
	      Set  maximum  advertisement interval in seconds.	Default is 600
	      secs.  Available only with -r option.

       -t     Test mode. Do not go to background.

       -v     Be verbose i.e. send lots of debugging messages to syslog.

       -V     Print version and exit.

HISTORY
       This program was developed by Sun Microsystems (see copyright notice in
       source	file).	 It   was   ported   to	  Linux	 by  Alexey  Kuznetsov
       <kuznet@ms2.inr.ac.ru>.	It is  now  maintained	by  YOSHIFUJI  Hideaki
       <yoshfuji@skbuff.net>.

SEE ALSO
       icmp(7), inet(7), ping(8).

REFERENCES
       Deering,	 S.E.,ed  "ICMP	 Router	 Discovery Messages", RFC1256, Network
       Information Center, SRI International, Menlo  Park,  Calif.,  September
       1991.

SECURITY
       rdisc  requires	CAP_NET_RAW to listen and send ICMP messages and capa‐
       bility CAP_NET_ADMIN to update routing tables.

AVAILABILITY
       rdisc is part of iputils package and the latest versions are  available
       in    source    form    at   http://www.skbuff.net/iputils/iputils-cur‐
       rent.tar.bz2.

iputils-121221			24 January 2013			      RDISC(8)
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