Multiplexing communication routes with proxy-network to avoid intentional barriers in large scale network

It has become common to operate an IT system where client computers in offices in a country access cloud computers in another country via the Internet. On the other hand, in some countries including China, network communication is often shut down by governmental bodies, in addition to network outage caused by network attacks. In the presence of these intentional or deliberate interruptions, users of such systems need some countermeasures to avoid them. In this paper, we propose a method to form bypass routes which consists of application-level gateways, and intelligent routers, which are placed at offices where client computers are run, to select bypass routes based on the status of the Internet. A method for applying asymmetric criteria in order to decide whether to apply bypass routes is proposed for robust operation of Internet-based applications. In our approach, differential values of network latency are used for detecting intentional barriers, and absolute values to determine their ends. This method is applied in practice and supports the continuity of network based systems in China.