76 lines
2.4 KiB
Groff
76 lines
2.4 KiB
Groff
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.TH RARPD 8
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.SH NAME
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rarpd \- reverse address resolution protocol daemon
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.SH SYNOPSIS
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.B rarpd
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.RB [ \-d [\fIlevel\fR]]
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.I network-name
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\&...
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.SH DESCRIPTION
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.de SP
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.if t .sp 0.4
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.if n .sp
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..
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.B Rarpd
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listens on the given networks for broadcast packets asking for reverse address
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resolution. These packets are sent by hosts at boot time to find out their
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IP address.
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.B Rarpd
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looks up the six octet ethernet number in the
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.B /etc/ethers
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file finding a host name. This name is translated to the IP address of the
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host by a DNS lookup. The IP address is then sent to the host.
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.PP
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Under Minix the program forks as needed to give each network its own server.
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Under Minix-vmd all networks are handled in the same program using async I/O.
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.SS "Private Ethernet Addresses"
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For VU practical work, where students have to create their own IP stack
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starting at the bottom with RARP, this implementation recognizes Ethernet
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addresses starting with octet 0x76 as special. The next octet is used as a
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additional host number and the next and last four octets as an IP address
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that this Ethernet address is additional for. The IP address is translated
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back to a name, and the first component of that name gets a dash and the
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additional host number added to it. That hostname is then looked up and its
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IP address returned in a RARP reply. Example:
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.PP
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.RS
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.ta +\w'flotsam-3.example.commmm'u
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76:3:c0:a8:e7:fa Additional 3, IP 192.168.231.250
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.SP
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flotsam.example.com Reverse lookup on 192.168.231.250
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.SP
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flotsam-3.example.com Splicing in additional number
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.SP
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192.168.231.42 Forward lookup
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.RE
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.PP
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In this example a RARP query for 76:3:c0:a8:e7:fa gets 192.168.231.42 as reply.
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.SH OPTIONS
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.TP
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.BR \-d [\fIlevel\fP]
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Turns on debugging messages at the given level, by default 1. At level 1 you
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will be shown what answers are sent, and at level 2 or higher you will be told
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about queries from unknown hosts or host on the wrong network.
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The debug level can also be increased by 1 at runtime by sending signal
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.B SIGUSR1
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or turned off (set to 0) with
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.BR SIGUSR2 .
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.SH "SEE ALSO"
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.BR ifconfig (8),
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.BR ethers (5),
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.BR hosts (5),
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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 irdpd (8),
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.BR inetd (8),
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.BR nonamed (8).
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.SH NOTES
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A "network name" is the device name of the IP device of a network, i.e.
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.BR ip0 ,
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.BR ip1 ", ..."
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.PP
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The RARP protocol has gone out of fashion in favour of DHCP.
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.SH AUTHOR
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Kees J. Bot (kjb@cs.vu.nl)
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