The protocols file contains information regarding the known protocols used in the TCP/IP. For each protocol a single line should be present with the following information:
official-protocol-name protocol-number aliases
Items are separated by any number of blanks and/or TAB characters. A `#' indicates the beginning of a comment; characters up to the end of the line are not interpreted by routines which search the file.
Protocol names may contain any printable character other than a field delimiter, NEWLINE, or comment character.
The following example is taken from SunOS.
# # Internet (IP) protocols # ip 0 IP # internet protocol, pseudo protocol number icmp 1 ICMP # internet control message protocol ggp 3 GGP # gateway-gateway protocol tcp 6 TCP # transmission control protocol pup 12 PUP # PARC universal packet protocol udp 17 UDP # user datagram protocol
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