套接字程序，用于演示网络中的链路层通信，而无需使用IP地址

As we all know that within a network, communication is by the MAC address and not by the ip address. So I always used to think that whether we can write a socket program in server-client paradigm which are only using MAC address for communication but not ip address i.e. the struct sock_in should be left unfilled, and within a lan they should be able to communicate.As we all know that within a network, communica