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    The following form allows you to view linux man pages.

    Command:

    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 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.
    
    
    

    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.
    
           -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
    
    
    

    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 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-071127 23 July 2015 RDISC(8)

    
    
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