PROTOCOLS(5) manual page
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protocols - 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 IANA (Internet Assigned
Numbers Authority).
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:
- 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 network-wide naming service like Yellow Pages/NIS
or BIND/Hesiod.
- /etc/protocols
- The protocols definition file.
getprotoent(3)
This page is part of release 3.78 of the Linux man-pages project.
A description of the project, information about reporting bugs, and the
latest version of this page, can be found at http://www.kernel.org/doc/man-pages/.
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