protocols(4)           UNIX System V(Internet Utilities)           protocols(4)


NAME
      protocols - protocol name data base

SYNOPSIS
      /etc/protocols

DESCRIPTION
      The protocols file contains information regarding the known protocols
      used in the DARPA Internet.  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.

EXAMPLE
      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
      pup     12      PUP     # PARC universal packet protocol
      udp     17      UDP     # user datagram protocol

FILES
      /etc/protocols

SEE ALSO
      getprotoent(3N)

NOTES
      A name server should be used instead of a static file.  A binary indexed
      file format should be available for fast access.












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