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       protocols - the protocols definition file


       This  file is a plain ASCII file, describing the various DARPA internet
       protocols that are available from the TCP/IP subsystem.  It  should  be
       consulted  instead  of using the numbers in the ARPA include files, or,
       even worse, just  guessing  them.  These  numbers  will  occur  in  the
       protocol field of any ip header.

       Keep  this  file  untouched  since changes would result in incorrect ip
       packages.  Protocol  numbers  and  names  are  specified  by  the  IANA
       (Internet Assigned Numbers Authority).

       Each line is of the following format:

              protocol number aliases ...

       where  the  fields  are  delimited  by spaces or tabs.  Empty lines are
       ignored.  If a line contains a hash mark (#), the  hash  mark  and  the
       part of the line following it are ignored.

       The field descriptions are:

              the native name for the protocol. For example ip, tcp, or udp.

       number the  official  number for this protocol as it will appear within
              the ip header.

              optional aliases for the protocol.

       This file might be distributed  over  a  network  using  a  networkwide
       naming service like Yellow Pages/NIS or BIND/Hesiod.


              The protocols definition file.



       Guide to Yellow Pages Service

       Guide to BIND/Hesiod Service