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Linux 2.6 - man page for protocols (linux section 5)

PROTOCOLS(5)			    Linux Programmer's 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
       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
       /etc/protocols
	      The protocols definition file.

SEE ALSO
       getprotoent(3)

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

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2012-08-05				     PROTOCOLS(5)


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