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

NAME
       arpd - userspace arp daemon.

SYNOPSIS
       Usage:  arpd [ -lkh? ] [ -a N ] [ -b dbase ] [ -B number ] [ -f file ] [-p interval ] [ -n
       time ] [ -R rate ] [  ]

DESCRIPTION
       The arpd daemon collects gratuitous ARP information, saving it on local disk  and  feeding
       it to the kernel on demand to avoid redundant broadcasting due to limited size of the ker‐
       nel ARP cache.

OPTIONS
       -h -?  Print help

       -l     Dump the arpd database to stdout and exit. The output consists  of  three  columns:
              the  interface  index,  the IP address of the interface, and the MAC address of the
              interface. Negative entries for dead hosts are also shown, in  this  case  the  MAC
              address is replaced by the word FAILED followed by a colon and the most recent time
              when the fact that the host is dead was proven.

       -f 
              Read and load an arpd database from FILE in a text format similar to that dumped by
              option  -l.  Exit  after load, possibly listing resulting database, if option -l is
              also given. If FILE is -, stdin is read to get the ARP table.

       -b 
              the location of the database file. The default location is /var/lib/arpd/arpd.db

       -a 
              With this option, arpd not only passively listens for ARP packets on the interface,
              but  also  sends  broadcast queries itself. NUMBER is the number of such queries to
              make before a destination is considered dead. When arpd is started as kernel helper
              (i.e.  with  app_solicit  enabled  in  sysctl  or even with option -k) without this
              option and still did not learn enough information, you can observe 1 second gaps in
              service. Not fatal, but not good.

       -k     Suppress  sending  broadcast  queries  by  the kernel. This option only makes sense
              together with option -a.

       -n 

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