.\" Copyright (c) 1995 Martin Schulze .\" .\" 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., 675 Mass Ave, Cambridge, MA 02139, .\" USA. .\" .\" Wed Oct 18 20:23:54 MET 1995 Martin Schulze .\" * first released .\" .TH PROTOCOLS 5 "18 October 1995" "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 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 and lines starting with a hash mark (#) are ignored. Remainder of lines are also ignored from the occurrence of a hash mark. 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/Hesoid. .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