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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 proto‐
        col 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 (Inter‐
        net 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 nam‐
        ing service like Yellow Pages/NIS or BIND/Hesiod.

FILES

        /etc/protocols
               The protocols definition file.
        getprotoent(3)
 
        Guide to Yellow Pages Service
 
        Guide to BIND/Hesiod Service
 
        http://www.iana.org/assignments/protocol-numbers