75 lines
2.3 KiB
Groff
75 lines
2.3 KiB
Groff
.TH IRDPD 8
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.SH NAME
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irdpd \- internet router discovery protocol daemon
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.SH SYNOPSIS
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.B irdpd
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.RB [ \-bd ]
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.RB [ \-U
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.IR udp-device ]
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.RB [ \-I
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.IR ip-device ]
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.RB [ \-o
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.IR priority-offset ]
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.SH DESCRIPTION
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.B Irdpd
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looks for routers. This should be a simple task, but some routers are hard
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to find because they do not implement the router discovery protocol. This
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daemon collects information that routers do send out and makes it available.
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.PP
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At startup
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.B irdpd
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sends out several router solicitation broadcasts. A good router should
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respond to this with a router advertisement.
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.PP
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If a router advertisement arrives then no more solicitations are sent. The
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TCP/IP server has filled its routing table with the info from the
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advertisement, so it now has at least one router. If the advertisement is
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sent by a genuine router (the sender is in the table) then the
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.B irdpd
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daemon goes dormant for the time the advert is valid. Routers send new
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adverts periodically, keeping the daemon silent.
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.PP
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Otherwise
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.B irdpd
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will listen for RIP (Router Information Protocol) packets. These packets
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are sent between routers to exchange routing information.
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.B Irdpd
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uses this information to build a routing table.
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.PP
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Every now and then a router advertisement is sent to the local host to give
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it router information build from the RIP packets.
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.SH OPTIONS
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.TP
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.B \-b
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Broadcast advertisements instead of sending them to the local host only.
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This may be used to keep (non-Minix) hosts alive on a net without adverts.
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.TP
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.B \-d
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Debug mode, tell where info is coming from and where it is sent. Debugging
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can also be turned on at runtime by sending signal
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.B SIGUSR1
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or turned off with
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.BR SIGUSR2 .
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.TP
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.BI \-o " priority-offset
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Offset used to make the gateway's preferences collected from RIP packets look
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worse than those found in genuine router adverts. By default
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.BR -1024 .
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.SH "SEE ALSO"
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.BR inet (8),
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.BR boot (8),
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.BR dhcpd (8),
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.BR inetd (8),
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.BR nonamed (8).
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.SH BUGS
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This daemon has gone out of favour thanks to
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.BR dhcpd ,
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that also does router solicitations among other things.
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.PP
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Under standard MINIX 3 this daemon can't listen to both IRDP and RIP
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at the same time, so it starts out with IRDP. It switches over to RIP
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if it can't find a router, or if it threatens to lose its router. It
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does not switch back.
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.SH AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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