ARPD(8)                   BSD System Manager's Manual                  ARPD(8)

NAME
     arpd -- ARP reply daemon

SYNOPSIS
     arpd [-d] [-i interface] [net ...]

DESCRIPTION
     arpd replies to any ARP request for an IP address matching the specified
     destination net with the hardware MAC address of the specified interface,
     but only after determining if another host already claims it.

     Any IP address claimed by arpd is eventually forgotten after a period of
     inactivity or after a hard timeout, and is relinquished if the real owner
     shows up.

     This enables a single host to claim all unassigned addresses on a LAN for
     network monitoring or simulation.

     arpd exits on an interrupt or termination signal.

     The options are as follows:

     -d      Do not daemonize, and enable verbose debugging messages.

     -i interface
             Listen on interface.  If unspecified, arpd searches the system
             interface list for the lowest numbered, configured ``up'' inter-
             face (excluding loopback).

     net     The IP address or network (specified in CIDR notation) or IP
             address ranges to claim (e.g. ``10.0.0.3'', ``10.0.0.0/16'' or
             ``10.0.0.5-10.0.0.15''). If unspecified, arpd will attempt to
             claim any IP address it sees an ARP request for.  Mutiple
             addresses may be specified.

FILES
     /var/run/arpd.pid

SEE ALSO
     pcapd(8), synackd(8)

AUTHORS
     Dug Song <dugsong@monkey.org>, Niels Provos <provos@citi.umich.edu>

                                August 4, 2001