说明：  此软件是从事嵌入式的开发人员进行TCPIP学习时使用的代码，有一定的指导意义，里面包括ARP ICMP IGMP OSPF协议等网络相关的协议代码，并且里面有SIP等语音网关的相关协议的代码。
(this software is embedded engaged in the development of personnel TCPIP learning to use the code, a certain guiding significance, ARP, ICMP, including inside IGMP networks such as OSPF protocol agreements related to the code, and there are other SIP Voice Gateway relevant agreements code.)