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+.\" Copyright (c) 1995 Martin Schulze <joey@infodrom.north.de>
+.\"
+.\" This is free documentation; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License as
+.\" published by the Free Software Foundation; either version 2 of
+.\" the License, or (at your option) any later version.
+.\"
+.\" The GNU General Public License's references to "object code"
+.\" and "executables" are to be interpreted as the output of any
+.\" document formatting or typesetting system, including
+.\" intermediate and printed output.
+.\"
+.\" This manual is distributed in the hope that it will be useful,
+.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
+.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+.\" GNU General Public License for more details.
+.\"
+.\" You should have received a copy of the GNU General Public
+.\" License along with this manual; if not, write to the Free
+.\" Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111,
+.\" USA.
+.\"
+.\" 1995-10-18 Martin Schulze <joey@infodrom.north.de>
+.\" * first released
+.\" 2002-09-22 Seth W. Klein <sk@sethwklein.net>
+.\" * protocol numbers are now assigned by the IANA
+.\"
+.TH PROTOCOLS 5 2002-09-22 "Linux" "Linux Programmer's Manual"
+.SH NAME
+protocols \- the protocols definition file
+.SH 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).
+.\" .. by the DDN Network Information Center.
+
+Each line is of the following format:
+
+.RS
+.I protocol number aliases ...
+.RE
+
+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:
+
+.TP
+.I protocol
+the native name for the protocol. For example ip, tcp, or udp.
+.TP
+.I number
+the official number for this protocol as it will appear within the ip
+header.
+.TP
+.I aliases
+optional aliases for the protocol.
+.LP
+
+This file might be distributed over a network using a networkwide
+naming service like Yellow Pages/NIS or BIND/Hesiod.
+
+.SH FILES
+.TP
+.I /etc/protocols
+The protocols definition file.
+.SH "SEE ALSO"
+.BR getprotoent (3)
+
+Guide to Yellow Pages Service
+
+Guide to BIND/Hesiod Service
+
+http://www.iana.org/assignments/protocol-numbers