Seamless Virtual Network for International Business Continuity in Presence of Intentional Blocks.

In developing countries, links are poor among domestic communities or internet service providers. Besides, international internet channels are suddenly blocked by such as Golden Shield (GS) in China. Offshore business communications are involved in these. To avoid such involvement, a seamless virtual network is proposed as an international business communication bridging solution. This uses Round Trip Time (RTT) based multiple thresholds for differential switch to Virtual Private Network (VPN) bypass. The characteristics are (1) using multiple threshold integrated differential calculus of RTT increase, a sign of the block is recognized as the steep staircase increase of RTT, (2) followed by the immediate automatic switch to VPN having RTT below 200ms. (3) Asymmetrically, only the absolute threshold value and continuation time are used to determine when to switch back. This method is analytically and statistically evaluated as being successful (below 3% errors), using around 200 cases of data on GS blocks. Furthermore, it has been validated by the real seamless usage in more than 20 offshore companies for three years. Besides response time in offshore applications, our method can also alleviate problems such as voice echoes and video jitters which irritate business users. These effects were validated analytically and by questionnaires to scores of business customers.