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�������պ����ѧѧ�� 2005, Vol. 31 Issue (07) :823-827    DOI:
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��ӱ, ��ʤ*
�������պ����ѧ ��е���̼��Զ���ѧԺ, ���� 100083
UDP based implementation of peer to peer communication
Xu Ying, Luan Sheng*
School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

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ժҪ ͨ��̽�������ַת���豸�ڽ���UDP (User Datagram Protocol) �˿�ӳ�������ڵ���ʱʱ�䴰��,������ʹ��UDP��͸�����ַת���豸��ԭ��.�����⼰���ַ�����������ʵ�ֵ����ݰ��������,����⶯̬ӳ��Ķ˿���Ϣ�Լ������ַת���豸�ڽ��ж˿�ӳ�������.̽���˲�ͬ���͵������ַת���豸������ʵ�ֵ�Ӱ��,�����˼������Լ������˶Զ�ͨѶ���̵ľ�������.����ʵ�ֿɱ��㷺Ӧ����IP������ʵʱ��Ƶ���ļ������Լ��ֲ�ʽ�����Ӧ����.
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Abstract�� By exploring the temporary UDP(user datagram protocol) port-mapping time window on NAT(network address translation) devices, the principal of using UDP to work through NAT devices was presented. A detection and handshaking server was proposed to solve the detection of dynamically mapped UDP ports. With packet reflecting service implemented at detection and handshaking server, port-mapping characteristics of NAT device and the external mapped UDP ports can be discovered. The procedures of the discovery process and the procedures of completing a peer to peer connection were presented. The implementation can benefit a broad range of applications like voice over IP, real-time video, file-sharing and peer to peer based distributed computing.
Keywords�� peer to peer   network address translation   firewall   port mapping     
Received 2004-10-30;
About author: �� ӱ(1969-),Ů,�Ĵ�������,����ʦ, xuying@buaa.edu.cn.
��ӱ, ��ʤ.����UDP�Ķ˶Զ�ͨѶ��ԭ��ʵ��[J]  �������պ����ѧѧ��, 2005,V31(07): 823-827
Xu Ying, Luan Sheng.UDP based implementation of peer to peer communication[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2005,V31(07): 823-827
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