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Plan 9 - man page for arp (plan9 section 3)

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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 kernel.  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)


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