man(1) Manual page archive

     ARP(3)                                                     ARP(3)

          arp - Internet Address Resolution Protocol

          bind -a #a /net/arp


          The arp device provides the means by which the kernel
          resolves IP addresses into Ethernet addresses.  A cache is
          maintained by the arp device to speed the process.

          The ctl file controls the ARP cache maintained by the ker-
          nel.  The flush control message invalidates all entries in
          the cache.  The delete ipaddr control message invalidates a
          single cache entry.  All IP addresses passed to the system
          are in the canonical textual form described in ip(2). The
          perm ipaddr control message makes an existing cache entry

          When the kernel boots, ipconfig sets up the IP stream and
          arpd opens #a/arp/data (see ipconfig(8)). This establishes
          the ARP cache and enables arpd to receive all ARP packets
          from the network, which it uses to maintain the cache by
          writing the results of address resolution requests back into
          the cache.  The IP stream module uses the cache to translate
          IP addresses.

          Subsequent opens of the data file allow the contents of the
          cache to be examined.  Each cache entry consists of an IP
          address, an Ethernet address, and the status of the entry.
          Entries may be invalid, permanent, or temporary.  Permanent
          entries will never be aged from the cache.  Temporary
          entries may be replaced by new addresses entered by the ARP

          The file stats reports the cache performance.

          ip(3), ipconfig(8)