protocols(5) — Linux manual page

NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON

protocols(5)               File Formats Manual              protocols(5)

NAME         top

       protocols - protocols definition file

DESCRIPTION         top

       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:

       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         top

       /etc/protocols
              The protocols definition file.

SEE ALSO         top

       getprotoent(3)http://www.iana.org/assignments/protocol-numbers

COLOPHON         top

       This page is part of the man-pages (Linux kernel and C library
       user-space interface documentation) project.  Information about
       the project can be found at 
       ⟨https://www.kernel.org/doc/man-pages/⟩.  If you have a bug report
       for this manual page, see
       ⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
       This page was obtained from the tarball man-pages-6.9.1.tar.gz
       fetched from
       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
       2024-06-26.  If you discover any rendering problems in this HTML
       version of the page, or you believe there is a better or more up-
       to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not
       part of the original manual page), send a mail to
       man-pages@man7.org

Linux man-pages 6.9.1          2024-05-02                   protocols(5)

Pages that refer to this page: getsockopt(2)socket(2)getprotoent(3)getprotoent_r(3)services(5)