| 1 | .TH IRDPD 8
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| 2 | .SH NAME
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| 3 | irdpd \- internet router discovery protocol daemon
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| 4 | .SH SYNOPSIS
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| 5 | .B irdpd
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| 6 | .RB [ \-bd ]
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| 7 | .RB [ \-U
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| 8 | .IR udp-device ]
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| 9 | .RB [ \-I
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| 10 | .IR ip-device ]
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| 11 | .RB [ \-o
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| 12 | .IR priority-offset ]
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| 13 | .SH DESCRIPTION
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| 14 | .B Irdpd
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| 15 | looks for routers. This should be a simple task, but some routers are hard
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| 16 | to find because they do not implement the router discovery protocol. This
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| 17 | daemon collects information that routers do send out and makes it available.
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| 18 | .PP
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| 19 | At startup
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| 20 | .B irdpd
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| 21 | sends out several router solicitation broadcasts. A good router should
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| 22 | respond to this with a router advertisement.
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| 23 | .PP
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| 24 | If a router advertisement arrives then no more solicitations are sent. The
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| 25 | TCP/IP server has filled its routing table with the info from the
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| 26 | advertisement, so it now has at least one router. If the advertisement is
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| 27 | sent by a genuine router (the sender is in the table) then the
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| 28 | .B irdpd
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| 29 | daemon goes dormant for the time the advert is valid. Routers send new
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| 30 | adverts periodically, keeping the daemon silent.
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| 31 | .PP
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| 32 | Otherwise
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| 33 | .B irdpd
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| 34 | will listen for RIP (Router Information Protocol) packets. These packets
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| 35 | are sent between routers to exchange routing information.
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| 36 | .B Irdpd
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| 37 | uses this information to build a routing table.
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| 38 | .PP
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| 39 | Every now and then a router advertisement is sent to the local host to give
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| 40 | it router information build from the RIP packets.
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| 41 | .SH OPTIONS
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| 42 | .TP
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| 43 | .B \-b
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| 44 | Broadcast advertisements instead of sending them to the local host only.
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| 45 | This may be used to keep (non-Minix) hosts alive on a net without adverts.
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| 46 | .TP
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| 47 | .B \-d
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| 48 | Debug mode, tell where info is coming from and where it is sent. Debugging
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| 49 | can also be turned on at runtime by sending signal
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| 50 | .B SIGUSR1
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| 51 | or turned off with
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| 52 | .BR SIGUSR2 .
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| 53 | .TP
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| 54 | .BI \-o " priority-offset
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| 55 | Offset used to make the gateway's preferences collected from RIP packets look
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| 56 | worse than those found in genuine router adverts. By default
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| 57 | .BR -1024 .
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| 58 | .SH "SEE ALSO"
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| 59 | .BR inet (8),
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| 60 | .BR boot (8),
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| 61 | .BR dhcpd (8),
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| 62 | .BR inetd (8),
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| 63 | .BR nonamed (8).
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| 64 | .SH BUGS
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| 65 | This daemon has gone out of favour thanks to
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| 66 | .BR dhcpd ,
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| 67 | that also does router solicitations among other things.
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| 68 | .PP
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| 69 | Under standard MINIX 3 this daemon can't listen to both IRDP and RIP
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| 70 | at the same time, so it starts out with IRDP. It switches over to RIP
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| 71 | if it can't find a router, or if it threatens to lose its router. It
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| 72 | does not switch back.
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| 73 | .SH AUTHOR
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| 74 | Kees J. Bot (kjb@cs.vu.nl)
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