How China Block Virtual Private Networks (VPN) Service?

August 4, 2017
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Chinese authorities have begun enlisting telecommunications firms to filter internet traffic on a more granular level, intercepting traffic in household modems and on mobile phone. China’s firewall currently filters and blocks traffic between Chinese and overseas servers and is managed by authorities. Internet users in China resort to using Virtual Private Networks (VPN) to access blocked websites, but with the new regulation, their days of VPN use could be numbered.

From the above, we can see the Regular Internet, the signal will send out from the local server to the overseas servers. After that, the signal will send back from the overseas server , then we will be able to browse the relevant content.

But in the “Chinese network”, the Chinese government set up a “Firewall” between the local server and overseas server.As long as it is response from  the banned overseas server, it will be blocked by the wall.

As for the VPN Software, it create a gap in this “network wall”. The signal can pass through this gap and let the users browse the blocked overseas content.

But in the latest blockade, the Chinese government added the second “wall” in the local server. The new “wall” is not blocking the overseas server, but it directly block the signal to the VPN service, So that most of the VPN can not operate. Moreover, because of the “wall” directly built in the local server, it can monitor the smart phone and other devices more easy.

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