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rdisc



SYNOPSIS

       rdisc [ -abdfstvV]  [ 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 mes≠
       sages 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_SOLICITA≠
       TION  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.


OPTIONS

       -a     Accept  all routers independently of the preference
              they have in their  advertise  messages.   Normally
              rdisc  only accepts (and enters in the kernel rout≠
              ing 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

       -V     Print version and exit.


HISTORY

       This program was developed by Sun Microsystems (see  copy≠
       right  notice  in  source file). It was ported to Linux by
       Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>.


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_RAWIO to listen and send ICMP  mes≠
       sages  and  capability  CAP_NET_ADMIN  to  update  routing
       tables.


AVAILABILITY

       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-021109            09 ÓŌ—¬“— 2002                 RDISC(8)
  
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