Many hosting provider using OpenVZ virtualization turn off tun/tap, don`t you?
By default, the tun/tap support is turned off on OpenVZ, but we can turn on it due to request to tech support.
VPS vs OpenVZRegistration
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By default, the tun/tap support is turned off on OpenVZ, but we can turn on it due to request to tech support.
VPS vs OpenVZ