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PROTOCOLS(5)               Linux Programmer’s Manual              PROTOCOLS(5)



NAME
       protocols - the protocols definition file

DESCRIPTION
       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.  Pro-
       tocol  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:


       protocol
              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.

       aliases
              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.


FILES
       /etc/protocols
              The protocols definition file.

SEE ALSO
       getprotoent(3)

       Guide to Yellow Pages Service

       Guide to BIND/Hesiod Service

       http://www.iana.org/assignments/protocol-numbers



Linux                             2002-09-22                      PROTOCOLS(5)

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