System Manager's Manual: iputils
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# rarpd

## Name

rarpd -- answer RARP REQUESTs

## Synopsis

arping [`-aAvde`] [-b `bootdir`] [`interface`]

## DESCRIPTION

Listens RARP requests from clients. Provided MAC address of client is found in `/etc/ethers` database and obtained host name is resolvable to an IP address appropriate for attached network, rarpd answers to client with RARPD reply carrying an IP address.

To allow multiple boot servers on the network rarpd optionally checks for presence Sun-like bootable image in TFTP directory. It should have form `Hexadecimal_IP.ARCH`, f.e. to load sparc 193.233.7.98 `C1E90762.SUN4M` is linked to an image appropriate for SUM4M in directory `/etc/tftpboot`.

## WARNING

This facility is deeply obsoleted by BOOTP and later DHCP protocols. However, some clients really still need this to boot.

## OPTIONS

`-a`

  Listen on all the interfaces. Currently it is an internal option, its function is overridden with `interface` argument. It should not be used.

`-A`

  Listen not only RARP but also ARP messages, some rare clients use ARP by some unknown reason.

`-v`

  Be verbose.

`-d`

  Debug mode. Do not go to background.

`-e`

  Do not check for presence of a boot image, reply if MAC address resolves to a valid IP address using `/etc/ethers` database and DNS.

`-b `bootdir``

  TFTP boot directory. Default is `/etc/tftpboot`

## SEE ALSO

arping(8), tftpd(8).

## AUTHOR

rarpd was written by Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>. It is now maintained by YOSHIFUJI Hideaki <yoshfuji@skbuff.net>.

## SECURITY

rarpd requires `CAP_NET_RAW` capability to listen and send RARP and ARP packets. It also needs `CAP_NET_ADMIN` to give to kernel hint for ARP resolution; this is not strictly required, but some (most of, to be more exact) clients are so badly broken that are not able to answer ARP before they are finally booted. This is not wonderful taking into account that clients using RARPD in 2002 are all unsupported relic creatures of 90's and even earlier.

## AVAILABILITY

rarpd is part of `iputils` package and the latest versions are available in source form at http://www.skbuff.net/iputils/iputils-current.tar.bz2.

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