Big Sur Camping

Nov 13, 2020 OpenVPN (Tunnelblick connections) works in Big Sur but not in Linux/Windows over NAT. All internet traffic to virtual machines also stopps as soon as I connect VPN. Disconnecting VPN returns internet access. Installation of Tunnelblick on Mac (OpenVPN) MacOS Big Sur 10.16 was released on November 12th, 2020. Centrally maintained University of Helsinki computers will be updated according to a schedule determined after testing. New computers will be with macOS Big Sur installed. Installing Kexts on an Intel Mac running macOS Big Sur On an Intel Mac, the process of installing Tunnelblick's system extensions requires one restart of your computer. Use the button on the 'Utilities' panel to install Tunnelblick's Tun and Tap system extensions.

BigSur and Tunnelblick VPN client – Cannot allocate TUN/TAP dev dynamically

When running on macOS Big Sur 11.0.1 or later, Tunnelblick forces the settings on Tunnelblick’s “Advanced” settings window to “never load” system extensions. (The developers plan to release a version of Tunnelblick which will be “smarter” about this.)

Tunnelblick Big Sur

• 2021-01-29 08:37:12.201142 MANAGEMENT: Client disconnected
• 2021-01-29 08:37:12.201217 Cannot allocate TUN/TAP dev dynamically
• 2021-01-29 08:37:12.201281 Exiting due to fatal error
• 2021-01-29 08:37:13.766778 *Tunnelblick: Expected disconnection occurred.

You can override that behavior and allow the settings to act normally by executing the following command in Terminal:

defaults write net.tunnelblick.tunnelblick bigSurCanLoadKexts -bool yes

The override can be removed by executing:

Tunnelblick Big Sur California

defaults delete net.tunnelblick.tunnelblick bigSurCanLoadKexts