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IRDPD(8)                    System Manager's Manual                   IRDPD(8)

       irdpd - internet router discovery protocol daemon

       irdpd [-bd] [-U udp-device] [-I ip-device] [-o priority-offset]

       Irdpd  looks  for  routers.   This  should  be  a simple task, but some
       routers are hard to find because  they  do  not  implement  the  router
       discovery  protocol.   This daemon collects information that routers do
       send out and makes it available.

       At startup irdpd sends out several router solicitation  broadcasts.   A
       good router should respond to this with a router advertisement.

       If  a router advertisement arrives then no more solicitations are sent.
       The TCP/IP server has filled its routing table with the info  from  the
       advertisement, so it now has at least one router.  If the advertisement
       is sent by a genuine router (the sender is in the table) then the irdpd
       daemon goes dormant for the time the advert is valid.  Routers send new
       adverts periodically, keeping the daemon silent.

       Otherwise irdpd will  listen  for  RIP  (Router  Information  Protocol)
       packets.   These  packets  are sent between routers to exchange routing
       information.  Irdpd uses this information to build a routing table.

       Every now and then a router advertisement is sent to the local host  to
       give it router information build from the RIP packets.

       -b     Broadcast  advertisements  instead  of sending them to the local
              host only.  This may be used to keep (non-Minix) hosts alive  on
              a net without adverts.

       -d     Debug mode, tell where info is coming from and where it is sent.
              Debugging can also be turned on at  runtime  by  sending  signal
              SIGUSR1 or turned off with SIGUSR2.

       -o priority-offset
              Offset used to make the gateway's preferences collected from RIP
              packets look worse than those found in genuine  router  adverts.
              By default -1024.

       inet(8), boot(8), dhcpd(8), inetd(8), nonamed(8).

       This  daemon  has  gone  out  of favour thanks to dhcpd, that also does
       router solicitations among other things.

       Under standard MINIX 3 this daemon can't listen to both IRDP and RIP at
       the  same time, so it starts out with IRDP.  It switches over to RIP if
       it can't find a router, or if it threatens to lose its router.  It does
       not switch back.

       Kees J. Bot (