关于不插网线无法ping本机的问题.即使拔掉网线，TCP/IP协议也不会被禁用，TCP/IP应用程序的调试工作可以照常进行-About unplugged cable can not ping the problem machine. Even unplug the cable, TCP/IP protocol can not be disabled, TCP/IP applications can debug as usual

UDP 通信， 通过网线可以实现两台电脑的通信(UDP communications, through the network cable, two computers can be achieved communication)