Abstract
Socket is a way of process communication, that is used it to invoke some API function to realize the distribution network libraries in different host of data exchange between the relevant process. According to the TCP/IP protocol assigned to the network address of the local host, to communicate between the two processes, the host must know the other’s location first, that is, the IP of the other host. At the same time, to get the port number, it is used to identify the local communication process; a local process in communication will occupy a port number, different process port number is different, so it must be assigned a port number that is not used before communication. A complete inter-network process consists of two processes and should use the same high-level protocol. IPV9 is the most important part of future network. This paper introduces the interface function and socket of IPV9, which lays a foundation for further network application programming.