inet(5P)                                                 inet(5P)



NAME
     inet - Internet protocol family

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

DESCRIPTION
     inet is a collection of protocols layered on top of 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.

Addressing
     Internet addresses are four-byte quantities, stored in
     network standard format.  (On VAX computers, internet
     addresses 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 can be created with the address INADDR_ANY to effect
     ``wildcard'' matching on incoming messages.

Protocols
     The Internet protocol family comprises 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; UDP is used to support the SOCK_DGRAM
     abstraction.  You can obtain a raw interface to IP by
     creating an Internet socket of type SOCK_RAW.  The ICMP is
     not directly accessible.

WARNINGS
     The Internet protocol support is subject to change as the
     Internet protocols develop.  Users should not depend on
     details of the current implementation, but rather on the
     services exported.





January 1992                                                    1

inet(5P)                                                 inet(5P)



SEE ALSO
     ip(5P), tcp(5P), udp(5P)





















































2                                                    January 1992