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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, includ-
       ing the NIS maps ``protcols.byname'' and "protocols.bynumber"  and  the
       NIS+ table ``protocols''. Programs use the getprotobyname(3SOCKET) rou-
       tine 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 <&lt;TAB>&gt; 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. Proto-
       col names may contain any printable character other than a field delim-
       iter, <&lt;NEWLINE>&gt;, 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 5.10                        13 Jun 2002                     protocols(4)