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NAT把一个区域的IP地址映射到另一个区域的IP地址,为主机之间提供透明的路由,所以它能有效地解决IPv4地址紧缺问题。分析了用以解决IP地址匮乏的NAT给P2P通信带来的困难,阐述了以UDP打洞技术实现内网用户互连的NAT穿透原理。
NAT maps the IP address of one area to the IP address of another area to provide transparent routing between hosts so that it can effectively solve the problem of shortage of IPv4 addresses. This paper analyzes the difficulties of NAT to solve the problem of NAT which is lack of IP address and expounds the NAT traversal principle of UDP interworking.