The files in this directory provide access to useful Ethernet numbers
for troubleshooting.  These numbers are described in this excerpt from
the Network Reading List. 

``3.7.1.  Ethernet Type Numbers and Addresses

           The Ethernet frame specified by the DIX standard contains  a
           Type  field.   The  DIX  Ethernet Type field contains a type
           number that describes the type of high-level network  proto-
           col  (such  as  TCP/IP) being carried by the Ethernet frame.
           This information can  be  quite  handy  when  you're  troub-
           leshooting  a  LAN  problem  and  trying to figure out which
           high-level protocol may be involved.

           In the new IEEE 802.3 frame specification,  the  type  field
           was  replaced  by  a  more general, but more complex, set of
           frame  specifiers.   Nevertheless,  many  network   software
           implementations  still  use the DIX frame specification with
           its accompanying Ethernet type field.

           The addresses used in Ethernet frames are also useful to the
           network  troubleshooter.   The  48-bit  Ethernet  address is
           called an "Organizationally Unique Identifier" (OUI) and  is
           divided  into  two  24-bit  portions.   The first portion is
           assigned to a specific manufacturer  by  the  IEEE  and  the
           second  portion  is  used  by  that manufacturer to create a
           unique address  for  each  Ethernet  interface.   

           If you know the manufacturer's number,  you  can  frequently
           identify  which  computer  may  be causing network problems.
           This is not a foolproof mechanism, since  some  vendors  may
	   buy  their boards from other manufacturers.  Nonetheless, in
           many cases knowing the  Ethernet  addresses  assigned  to  a
           manufacturer can help track down a malfunctioning device.''