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DNS leak is a security flaw, which can be used by your ISP or DNS server provider to log your activity, collect statistics, block access to some domains, or other purposes. Even though you are using encrypted VPN service with DNS leak your privacy is at risk.
By connecting to the internet with OpenTunnel, you create a secure private tunnel for your internet traffic and don't need to disclose your IP address thus preventing DNS leaks. Only a secure and trusted Tunneling provider like OpenTunnel can actually prevent DNS leaks.