P2P应用中一种多层NAT穿透解决方案的设计与实现

摘要

In this paper, all kinds of multilayer Network Address Translation (NAT) penetrate models were analyzed.The problem existing in multilayer NAT traversal was discussed. To solve this problem, the idea of selecting a suitable node as super node based on network environment and designating appropriate super node for the two nodes which need to communicate in order to help communication between them was put forward. The dynamic selection rules of super node were designed. The conversion from P2P topological structure to topological table was completed. The NAT penetrates of P2P systems arbitrary levels were realized by node topological table and the experiment verified the feasibility of the solution to multilayer NAT penetrate given in this paper.%在说明多层NAT各种穿越模型结构的基础上,剖析了多层NAT打孔穿越中存在的问题,提出了根据网络环境适当选取节点作为超级节点,为需要通信的两个节点指定超级节点辅助它们通信的设计思想.然后介绍了具体方案:包括超级节点的动态选取规则,P2P拓扑结构图向拓扑结构表的转换,借助于节点拓扑结构表实现P2P系统任意层次的NAT穿越.最后通过实验验证了多层NAT穿透解决方案的可行性.