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OpenSolaris 2009.06 - man page for protocols (opensolaris section 4)

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protocols(4)				   File Formats 			     protocols(4)

       protocols - protocol name database



       The protocols file  is a local source of information regarding the known protocols used in
       the DARPA Internet. The protocols file can be used in conjunction with or instead of other
       protocols sources, including the NIS maps ``protcols.byname'' and "protocols.bynumber" and
       the NIS+ table ``protocols''. Programs use the getprotobyname(3SOCKET) routine  to  access
       this information.

       The protocols file has one line for each protocol. The line has the following format:

	 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  rou-
       tines which search the file. Protocol names may contain any printable character other than
       a field delimiter, NEWLINE, or comment character.

       Example 1 A Sample Database

       The following is a sample database:

	 # 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
	 egp	     8	 EGP	     # exterior gateway protocol
	 pup	     12  PUP	     # PARC universal packet protocol
	 udp	     17  UDP	     # user datagram protocol

	 # Internet (IPv6) extension headers
	 hopopt      0	 HOPOPT      # Hop-by-hop options for IPv6
	 ipv6	     41  IPv6	     # IPv6 in IP encapsulation
	 ipv6-route  43  IPv6-Route  # Routing header for IPv6
	 ipv6-frag   44  IPv6-Frag   # Fragment header for IPv6
	 esp	     50  ESP	     # Encap Security Payload for IPv6
	 ah	     51  AH	     # Authentication Header for IPv6
	 ipv6-icmp   58  IPv6-ICMP   # IPv6 internet control message protocol
	 ipv6-nonxt  59  IPv6-NoNxt  # No next header extension header for IPv6
	 ipv6-opts   60  IPv6-Opts   # Destination Options for IPv6

       /etc/nsswitch.conf    configuration file for name-service switch

       getprotobyname(3SOCKET), nsswitch.conf(4)

       /etc/inet/protocols is the official SVR4 name of the protocols file.   The  symbolic  link
       /etc/protocols exists for BSD compatibility.

SunOS 5.11				   13 Jun 2002				     protocols(4)
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