ip(5P)                                                     ip(5P)



NAME
     ip - Internet Protocol

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

DESCRIPTION
     IP is the transport layer protocol used by the Internet
     protocol family.  It may be accessed through a ``raw
     socket'' when developing new protocols, or special purpose
     applications.  IP sockets are connectionless and are
     normally used with the sendto and recvfrom calls, though the
     connect(2N) call may also be used to fix the destination for
     future packets (in which case the read(2) or recv(2N) and
     write(2) or send(2N) system calls may be used).

     Outgoing packets automatically have an IP header prefixed to
     them (based on the destination address and the protocol
     number the socket is created with).  Likewise, incoming
     packets have their IP header stripped before being sent to
     the user.

STATUS MESSAGES AND VALUES
     A socket operation may fail with one of the following errors
     returned:

     EISCONN
          when trying to establish a connection on a socket which
          already has one, or when trying to send a datagram with
          the destination address specified and the socket is
          already connected.

     ENOTCONN
          when trying to send a datagram, but no destination
          address is specified, and the socket hasn't been
          connected.

     ENOBUFS
          when the system runs out of memory for an internal data
          structure.

     EADDRNOTAVAIL
          when an attempt is made to create a socket with a
          network address for which no network interface exists.

LIMITATIONS
     One should be able to send and receive ip options.

     The protocol should be settable after socket creation.





January 1992                                                    1

ip(5P)                                                     ip(5P)



SEE ALSO
     send(2N), recv(2N), inet(5F), intro(5)





















































2                                                    January 1992