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RedHat 9 (Linux i386) - man page for protocols (redhat section 5)

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PROTOCOLS(5)			    Linux Programmer's Manual			     PROTOCOLS(5)

       protocols - the protocols definition file

       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 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:

	      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.

	      optional aliases for the protocol.

       This file might be distributed over a network using a networkwide naming service like Yel-
       low Pages/NIS or BIND/Hesiod.

	      The protocols definition file.


       Guide to Yellow Pages Service

       Guide to BIND/Hesiod Service

Linux					    1995-10-18				     PROTOCOLS(5)
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