INET(4N)                COMMAND REFERENCE                INET(4N)



NAME
     inet - Internet protocol family

SYNOPSIS
     #include <sys/types.h>
     #include <netinet/in.h>

DESCRIPTION
     The Internet protocol family is a collection of protocols
     layered atop the Internet Protocol (IP) transport layer, and
     utilizing the Internet address format.  The Internet family
     provides protocol support for the SOCK_STREAM, SOCK_DGRAM,
     and SOCK_RAW socket types; the SOCK_RAW interface provides
     access to the IP protocol.

     Internet addresses are four byte quantities, stored in
     network standard format (on the VAX these are word and byte
     reversed).  The include file <netinet/in.h> defines this
     address as a discriminated union.

     Sockets bound to the Internet protocol family utilize the
     following addressing structure,

          struct sockaddr_in {
                 short     sin_family;
                 u_short   sin_port;
                 struct    in_addr sin_addr;
                 char      sin_zero[8];
          };

     Sockets may be created with the address INADDR_ANY to effect
     "wildcard" matching on incoming messages.

     The Internet protocol family is comprised of the IP
     transport protocol, Internet Control Message Protocol
     (ICMP), Transmission Control Protocol (TCP), and User
     Datagram Protocol (UDP).  TCP is used to support the
     SOCK_STREAM abstraction while UDP is used to support the
     SOCK_DGRAM abstraction.  A raw interface to IP is available
     by creating an Internet socket of type SOCK_RAW.  The ICMP
     message protocol is not directly accessible.

CAVEATS
     the Internet protocols develop.  Users should not depend on
     details of the current implementation, but rather the
     services exported.

SEE ALSO
     tcp(4N), udp(4N), and ip(4n).






Printed 4/6/89                                                  1

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