constant mapping

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

constant mapping

   Some TCP software constructs the destination Ethernet address
   from the top 24 bits of the Ethernet address followed by the
   low 24 bits of the (class A) destination Internet address.
   For this scheme the top 24 bits of the Ethernet address must
   be the same on all hosts on the net.  Contrast {ARP}.