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protocols(4)


NAME

  protocols - Defines the Internet protocols used on the local host


SYNOPSIS

  /etc/protocols


DESCRIPTION

  The /etc/protocols file contains information about the known protocols used
  in the Internet.  Each protocol is represented by a single line in the
  protocols file.  Each entry is of the form:

       Name Number Aliases

  The fields contain the following information:

  Name
      Official Internet protocol name.

  Number
      Protocol number.

  Aliases
      Unofficial names used for the protocol.

  Items on a line are separated by one or more spaces or tab characters.
  Comments begin with the # (number sign), and routines that search the
  protocols file do not interpret characters from the beginning of a comment
  to the end of the line.  A protocol name can contain any printable
  character except a field delimiter, newline character, or comment
  character.

  The lines in the file appear as follows:

       #
       # Internet (IP) protocols
       #
       ip      0    IP	       # internet protocol, pseudo protocol number
       icmp    1    ICMP       # internet control message protocol
       igmp    2    IGMP       # internet group management 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
       hopopt		0    HOPOPT	       # hop-by-hop options for ipv6
       ipv6	       41    IPV6	       # ipv6
       ipv6-route      43    IPV6-ROUTE	       # routing header for ipv6
       ipv6-frag       44    IPV6-FRAG	       # fragment header for ipv6
       esp	       50    ESP	       # encapsulating security payload
       ah	       51    AH		       # authentication header
       ipv6-icmp       58    IPV6-ICMP	       # icmp for ipv6
       ipv6-nonxt      59    IPV6-NONXT	       # no next header for ipv6
       ipv6-opts       60    IPV6-OPTS	       # destination options for ipv6.oE


SEE ALSO

  Functions: endprotoent(3), getprotobyname(3), getprotobynumber(3),
  getprotoent(3), setprotoent(3)

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