The protocols database lists the TCP/IP protocols installed on your system and their numbers; the Solaris installation program automatically creates it. It is rare when this file requires administrative handling.
The protocols database contains the names of the TCP/IP protocols installed on the system. Its syntax is completely described in the protocols(4) man page. Example 4-10 shows an example of the /etc/inet/protocols file:
# # Internet (IP) protocols # ip 0 IP # internet protocol, pseudo protocol number icmp 1 ICMP # internet control message protocol tcp 6 TCP # transmission control protocol udp 17 UDP # user datagram protocol