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IRDPD(8)							      IRDPD(8)

NAME
       irdpd - internet router discovery protocol daemon

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

DESCRIPTION
       Irdpd  looks  for  routers.   This  should  be  a simple task, but some
       routers are hard to find because they do not implement the router  dis‐
       covery 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) pack‐
       ets.  These packets are sent between routers to exchange routing infor‐
       mation.	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.

OPTIONS
       -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.

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

BUGS
       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.

AUTHOR
       Kees J. Bot (kjb@cs.vu.nl)

								      IRDPD(8)

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