Manual actions: Chinese authorities employ thousands of workers to censor forbidden content.Deep packet inspection (DPI): inspecting the headers in data packets to detect the destination IP address (website).Keyword and URL filtering: scanning websites and URLs for specific terms.DNS spoofing: diverting traffic from one website to another, which practically blocks you from accessing a desired website or app.IP blocking: blocking IP addresses that resolve to specific URLs (websites).The Great Firewall uses a combination of five methods to block websites and apps: As such, we cannot accurately analyze other performance data, like upload and download speeds or latency. For example, if it has worked 82% of the time, it will get a rating of 8.2/10.īecause we connect remotely from outside of China, our connection speeds are throttled. The percentage uptime of each VPN over the last 12 months is what determines its rating in this category. We believe this is the most accurate way to predict the long term performance of a VPN in China from outside the country. We collect this data once a week for 15 popular VPN services and use it to track the percentage reliability over the last three and 12 months. When testing a VPN, we attempt to connect to a server outside of mainland China using every available protocol on a variety of servers.Īs part of this process, we also follow any additional instructions from the VPN itself, including downloading special versions of its apps. We operate a virtual Windows 10 PC installed on a server near Shanghai to determine whether or not a VPN actually works in China.
The most important test for a VPN in China is whether it can bypass the Great Firewall (GFW), a name given to China’s web censorship infrastructure. We Recommend: Over 80% reliability in China. Minimum Requirement: Over 50% reliability in China.
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