| 1 | .TH RARPD 8
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| 2 | .SH NAME
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| 3 | rarpd \- reverse address resolution protocol daemon
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| 4 | .SH SYNOPSIS
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| 5 | .B rarpd
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| 6 | .RB [ \-d [\fIlevel\fR]]
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| 7 | .I network-name
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| 8 | \&...
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| 9 | .SH DESCRIPTION
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| 10 | .de SP
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| 11 | .if t .sp 0.4
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| 12 | .if n .sp
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| 13 | ..
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| 14 | .B Rarpd
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| 15 | listens on the given networks for broadcast packets asking for reverse address
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| 16 | resolution. These packets are sent by hosts at boot time to find out their
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| 17 | IP address.
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| 18 | .B Rarpd
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| 19 | looks up the six octet ethernet number in the
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| 20 | .B /etc/ethers
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| 21 | file finding a host name. This name is translated to the IP address of the
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| 22 | host by a DNS lookup. The IP address is then sent to the host.
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| 23 | .PP
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| 24 | Under MINIX 3 the program forks as needed to give each network its own server.
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| 25 | Under Minix-vmd all networks are handled in the same program using async I/O.
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| 26 | .SS "Private Ethernet Addresses"
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| 27 | For VU practical work, where students have to create their own IP stack
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| 28 | starting at the bottom with RARP, this implementation recognizes Ethernet
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| 29 | addresses starting with octet 0x76 as special. The next octet is used as a
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| 30 | additional host number and the next and last four octets as an IP address
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| 31 | that this Ethernet address is additional for. The IP address is translated
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| 32 | back to a name, and the first component of that name gets a dash and the
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| 33 | additional host number added to it. That hostname is then looked up and its
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| 34 | IP address returned in a RARP reply. Example:
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| 35 | .PP
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| 36 | .RS
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| 37 | .ta +\w'flotsam-3.example.commmm'u
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| 38 | 76:3:c0:a8:e7:fa Additional 3, IP 192.168.231.250
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| 39 | .SP
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| 40 | flotsam.example.com Reverse lookup on 192.168.231.250
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| 41 | .SP
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| 42 | flotsam-3.example.com Splicing in additional number
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| 43 | .SP
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| 44 | 192.168.231.42 Forward lookup
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| 45 | .RE
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| 46 | .PP
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| 47 | In this example a RARP query for 76:3:c0:a8:e7:fa gets 192.168.231.42 as reply.
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| 48 | .SH OPTIONS
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| 49 | .TP
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| 50 | .BR \-d [\fIlevel\fP]
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| 51 | Turns on debugging messages at the given level, by default 1. At level 1 you
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| 52 | will be shown what answers are sent, and at level 2 or higher you will be told
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| 53 | about queries from unknown hosts or host on the wrong network.
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| 54 | The debug level can also be increased by 1 at runtime by sending signal
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| 55 | .B SIGUSR1
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| 56 | or turned off (set to 0) with
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| 57 | .BR SIGUSR2 .
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| 58 | .SH "SEE ALSO"
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| 59 | .BR ifconfig (8),
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| 60 | .BR ethers (5),
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| 61 | .BR hosts (5),
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| 62 | .BR inet (8),
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| 63 | .BR boot (8),
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| 64 | .BR dhcpd (8),
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| 65 | .BR irdpd (8),
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| 66 | .BR inetd (8),
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| 67 | .BR nonamed (8).
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| 68 | .SH NOTES
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| 69 | A "network name" is the device name of the IP device of a network, i.e.
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| 70 | .BR ip0 ,
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| 71 | .BR ip1 ", ..."
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| 72 | .PP
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| 73 | The RARP protocol has gone out of fashion in favour of DHCP.
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| 74 | .SH AUTHOR
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| 75 | Kees J. Bot (kjb@cs.vu.nl)
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