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 inet(7F)							    inet(7F)




 NAME
      inet - Internet protocol family

 SYNOPSIS
      #include <&lt&lt&lt;sys/types.h>&gt&gt&gt;
      #include <&lt&lt&lt;netinet/in.h>&gt&gt&gt;

 DESCRIPTION
      The internet protocol family is a collection of protocols layered on
      top of the Internet Protocol (IP) network layer, which utilizes the
      internet address format.	The internet family supports the SOCK_STREAM
      and SOCK_DGRAM socket types.

    Addressing
      Internet addresses are four byte entities.  The include file
      <netinet/in.h> defines this address as the structure struct in_addr.

      Sockets bound to the internet protocol family utilize an addressing
      structure called struct sockaddr_in.  Pointers to this structure can
      be used in system calls wherever they ask for a pointer to a struct
      sockaddr.

      There are three fields of interest within this structure.	 The first
      is sin_family, which must be set to AF_INET.  The next is sin_port,
      which specifies the port number to be used on the desired host.  The
      third is sin_addr, which is of type struct in_addr, and specifies the
      address of the desired host.

    Protocols
      The internet protocol family is comprised of the IP network protocol,
      Internet Control Message Protocol (ICMP), Transmission Control
      Protocol (TCP), and User Datagram Protocol (UDP).	 TCP is used to
      support the SOCK_STREAM socket type while UDP is used to support the
      SOCK_DGRAM socket type.  The ICMP message protocol and IP network
      protocol are not directly accessible.

      The local port address is selected from independent domains for TCP
      and UDP sockets.	This means that creating a TCP socket and binding it
      to local port number 10000, for example, does not interfere with
      creating a UDP socket and also binding it to local port number 10000
      at the same time.

      Port numbers in the range 1-1023 inclusive are reserved for use by the
      super-user only.	Attempts to bind to port numbers in this range by
      non-super-users fail and result in an error returned.

 AUTHOR
      inet was developed by the University of California, Berkeley.

 SEE ALSO
      tcp(7P), udp(7P).



 Hewlett-Packard Company	    - 1 -   HP-UX Release 11i: November 2000