IP Address

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LEARN ABOUT PLAN9

arp

ARP(3)							     Library Functions Manual							    ARP(3)

NAME

       arp - Internet Address Resolution Protocol

SYNOPSIS

       bind -a #a /net/arp

       /net/arp/ctl
       /net/arp/data
       /net/arp/stats

DESCRIPTION

       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 permanent.

       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 server.

       The file stats reports the cache performance.

SEE ALSO

       ip(3), ipconfig(8)

SOURCE

       /sys/src/9/port/devarp.c

																	    ARP(3)

Shell Programming and Scripting