National Yang Ming Chiao Tung University

Kuan Lin Chen

Cheng Yu Yeh

Shaw Hwa Hwang

Ning Yun Ku

Yao Hsing Chung

Li Te Shen

Bing Chih Yao

Hsueh Ming Hang

Chi Jung Huang

Tzu Hung Lin

Ming Che Yeh

Shun Chieh Chang

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

Kuan Lin Chen