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 speci-
fied 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
The field descriptions are:
the native name for the protocol. For example ip, tcp
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 net-
workwide naming service like Yellow Pages/NIS or
The protocols definition file.
Guide to Yellow Pages Service
Guide to BIND/Hesiod Service