man > protocols(5)

protocols(5)                             File Formats Manual                            protocols(5)

NAME
       protocols - 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.  Protocol  num‐
       bers 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 con‐
       tains 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 network-wide naming service like Yellow
       Pages/NIS or BIND/Hesiod.

FILES
       /etc/protocols
              The protocols definition file.

SEE ALSO
       getprotoent(3)

       ]8;;http://www.iana.org/assignments/protocol-numbers\http://www.iana.org/assignments/protocol-numbers]8;;\

Linux man-pages 6.7                          2024-02-25                                 protocols(5)