aarp probe packets

from The Free On-line Dictionary of Computing (8 July 2008)

AARP probe packets

   <networking> {AARP} {packets} sent out on a nonextended
   {AppleTalk} network to discover whether a randomly selected
   node ID is being used by any node.  If not, the sending node
   uses the node ID.  If so, it chooses a different ID and sends
   more AARP probe packets.

   (1997-05-03)