Intelligent Bypass Method Exploiting VPN for Stable Offshore Business on the Internet

It has become common to access offshore cloud computers via the Internet. However, in some countries Governmental bodies suddenly block international communication channels. If involved in such blocking as called GS (Golden shield) in China, significant degradation of QoS occurs in accessing cloud/remote computers, Web conference pages, etc. To avoid such involvement and continue smooth access to offshore cloud systems, an intelligent bypass method using VPN from business companies to cloud/remote computer sites is proposed. The characteristics are as follows: (1) a sign of the above restriction is recognized, using differential calculus effective to predict the network latency increase of a multiple staircase, (2) immediately followed by switching to VPN bypass before serious network latency starts, (3) but, only the absolute threshold value and elapsed time are used asymmetrically to determine the end of bypassing. This method is verified by the latency data on real blocking of GS.