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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	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 ig-
       nored.  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 nam-
       ing 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 3.74 of the Linux man-pages project.  A
       description of the project, information about reporting bugs,  and  the
       latest	  version     of     this    page,    can    be	   found    at
       http://www.kernel.org/doc/man-pages/.

Linux				  2012-08-05			  PROTOCOLS(5)

NAME | DESCRIPTION | FILES | SEE ALSO | COLOPHON

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=protocols&sektion=5&manpath=Debian+8.1.0>

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