mirror of https://github.com/mkerrisk/man-pages
86 lines
2.6 KiB
Groff
86 lines
2.6 KiB
Groff
.\" Copyright (c) 1995 Martin Schulze <joey@infodrom.north.de>
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_FULL)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\"
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.\" The GNU General Public License's references to "object code"
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.\" and "executables" are to be interpreted as the output of any
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.\" document formatting or typesetting system, including
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.\" intermediate and printed output.
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.\"
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.\" This manual is distributed in the hope that it will be useful,
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.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
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.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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.\" GNU General Public License for more details.
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.\"
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.\" You should have received a copy of the GNU General Public
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.\" License along with this manual; if not, see
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.\" <http://www.gnu.org/licenses/>.
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.\" %%%LICENSE_END
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.\"
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.\" 1995-10-18 Martin Schulze <joey@infodrom.north.de>
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.\" * first released
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.\" 2002-09-22 Seth W. Klein <sk@sethwklein.net>
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.\" * protocol numbers are now assigned by the IANA
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.\"
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.TH PROTOCOLS 5 2012-08-05 "Linux" "Linux Programmer's Manual"
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.SH NAME
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protocols \- protocols definition file
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.SH DESCRIPTION
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This file is a plain ASCII file, describing the various DARPA internet
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protocols that are available from the TCP/IP subsystem.
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It should be
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consulted instead of using the numbers in the ARPA include files, or,
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even worse, just guessing them.
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These numbers will occur in the
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protocol field of any IP header.
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.PP
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Keep this file untouched since changes would result in incorrect IP
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packages.
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Protocol numbers and names are specified by the IANA
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(Internet Assigned Numbers Authority).
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.\" .. by the DDN Network Information Center.
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.PP
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Each line is of the following format:
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.PP
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.RS
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.I protocol number aliases ...
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.RE
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.PP
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where the fields are delimited by spaces or tabs.
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Empty lines are ignored.
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If a line contains a hash mark (#), the hash mark and the part
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of the line following it are ignored.
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.PP
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The field descriptions are:
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.TP
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.I protocol
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the native name for the protocol.
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For example
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.IR ip ,
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.IR tcp ,
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or
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.IR udp .
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.TP
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.I number
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the official number for this protocol as it will appear within the IP
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header.
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.TP
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.I aliases
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optional aliases for the protocol.
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.PP
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This file might be distributed over a network using a network-wide
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naming service like Yellow Pages/NIS or BIND/Hesiod.
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.SH FILES
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.TP
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.I /etc/protocols
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The protocols definition file.
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.SH SEE ALSO
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.BR getprotoent (3)
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.PP
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.UR http://www.iana.org\:/assignments\:/protocol\-numbers
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.UE
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