National Yang Ming Chiao Tung University

Shun Chieh Chang

Cheng Yu Yeh

Shaw Hwa Hwang

Bing Chih Yao

Yao Hsing Chung

Ning Yun Ku

Hsueh Ming Hang

Chi Jung Huang

Li Te Shen

Tzu Hung Lin

Ming Che Yeh

Kuan Lin Chen

The present invention provides a method for NAT traversal in VPN so that the VPN can detect the rule of port allocation for NAT outside the VPN to achieve NAT traversal. The communication structure according to the present invention includes a public network, a client network, a destination network, a first NAT, a second NAT. A DNAT-T proxy server is installed between the first NAT and the second NAT and has the function for the VPN to conduct a plurality of (N times) registrations before sending data out to detect the rule for NAT port allocation of the DNAT-T proxy server, and then inform the next NAT port allocation to the other side of the VPN so as to achieve NAT traversal for the data packets in VPN.

Method for NAT traversal in VPN

Growing community of inventors

Hsinchu, Taiwan

Shun Chieh Chang