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

       rdisc - network router discovery daemon

       rdisc [ -abdfstvV]  [ send_address]  [ receive_address]

       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 ( 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  net-
       work.  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

       Optionally,  rdisc  can	avoid waiting for routers to announce themselves by sending out a
       few ROUTER_SOLICITATION messages to the	ALL_ROUTERS  (  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 consid-
       ered 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.

       -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 preference 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.

       -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     Test mode. Do not go to background.

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

       -V     Print version and exit.

       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>.

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

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

       rdisc requires CAP_NET_RAWIO to listen and send ICMP messages and capability CAP_NET_ADMIN
       to update routing tables.

       rdisc is part of iputils package and the latest versions are  available in source form for
       anonymous ftp ftp://ftp.inr.ac.ru/ip-routing/iputils-current.tar.gz.

iputils-020927				27 September 2002				 RDISC(8)
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