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PROTOCOLS Section: Linux Programmer's Manual (5) Updated: 18 October 2025 Index   NAME protocols - the 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 DDN Network Information Center. Each line is of the following format: protocol number aliases ... 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: 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 networkwide naming service like Yellow Pages/NIS or BIND/Hesoid.   FILES /etc/protocols The protocols definition file.   SEE ALSO Guide to Yellow Pages Service Guide to BIND/Hesiod Service   Index NAME DESCRIPTION FILES SEE ALSO This document was created by using the manual pages. Time: 12:12:24 GMT, March 24, 2025

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