混合式P2P网络UDP下NAT穿越方案的研究与设计

Research and Design of NAT Travsering Scheme Based on Composite P2P Network on UDP

随着P2P网络技术的迅速发展,它给用户带来了巨大的便利和效益,P2P充分利用了网络带宽,大大提高了带宽的利用率。NAT技术的广泛应用主要是为了解决公共IP地址不足的问题,却对P2P的深入应用造成障碍,基于P2P的NAT穿越问题已经成为当今的热点议题。该方案根据混合式P2P网络中特殊结构的特点,借鉴skype的成功经验,改进超级节点UDP下NAT穿越的设计,利用超级节记录用户信息帮助P2P应用实现非对称NAT的穿越,利用超级节点中继来解决P2P下对称NAT的穿越,最终实现P2P的正常通信。

In recent years,the application based on P2P network technology has developed rapidly.It has brought the users tremendous convenience and efficiency,and P2P make full use of the network bandwidth,greatly increasing the bandwidth utilization.NAT technology handicaps the further P2P application,although it is widely used to solve the problem that caused by public IP addresses lackness.NAT traversing based on P2P has become a hotspot of VoIP application and the relevant technology of traversing are various.The special construction characteristic is used to implement P2P communication by utilizing skype experience and improving the NAT travsering scheme of super nodes on UDP.With the help of informations that recorded by super node,dissymmetry NAT travsering can be implemented by P2P applications,symmetry NAT travsering under P2P can be resolved by the relay of super nodes,and P2P communication can be archieved finally.