1protocols(5)                  File Formats Manual                 protocols(5)
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NAME

6       protocols - protocols definition file
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DESCRIPTION

9       This  file is a plain ASCII file, describing the various DARPA internet
10       protocols that are available from the TCP/IP subsystem.  It  should  be
11       consulted  instead  of using the numbers in the ARPA include files, or,
12       even worse, just guessing them.  These numbers will occur in the proto‐
13       col field of any IP header.
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15       Keep  this  file  untouched  since changes would result in incorrect IP
16       packages.  Protocol numbers and names are specified by the IANA (Inter‐
17       net Assigned Numbers Authority).
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19       Each line is of the following format:
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21              protocol number aliases ...
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23       where  the fields are delimited by spaces or tabs.  Empty lines are ig‐
24       nored.  If a line contains a hash mark (#), the hash mark and the  part
25       of the line following it are ignored.
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27       The field descriptions are:
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29       protocol
30              the native name for the protocol.  For example ip, tcp, or udp.
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32       number the  official  number for this protocol as it will appear within
33              the IP header.
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35       aliases
36              optional aliases for the protocol.
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38       This file might be distributed over a network using a network-wide nam‐
39       ing service like Yellow Pages/NIS or BIND/Hesiod.
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FILES

42       /etc/protocols
43              The protocols definition file.
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SEE ALSO

46       getprotoent(3)
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48       ⟨http://www.iana.org/assignments/protocol-numbers⟩
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52Linux man-pages 6.05              2022-10-30                      protocols(5)
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