Tunnelblick on macOS Big Sur
Important: See The Future of Tun and Tap VPNs on macOS for information about changes to future versions of macOS.
If you have an M1 Mac, also see Tunnelblick and Apple Silicon.
If you are using macOS Big Sur, you should use the latest beta version of Tunnelblick. You should allow Tunnelblick to automatically check for updates on the "Preferences" panel of Tunnelblick's "VPN Details" window. Be sure to put a check in "Check for updates to beta versions".
The following is the current status of issues that have been seen using Tunnelblick on macOS Big Sur.
To report an issue, please follow the instructions at Tunnelblick Issues.
FIX PLANNED: Tunnelblick's Tun and Tap system extensions do not load.
If your configuration requires a Tun or Tap system extension, connecting to your VPN will fail if an appropriate system extension is not loaded.
A future version of macOS will not allow the use of Tunnelblick's system extensions. See The Future of Tun and Tap VPNs on macOS.
On Intel Macs, Tunnelblick's system extensions can be used after doing the following (the process may be simplified in a future version of Tunnelblick):
You will also need to tell macOS that it should allow sytem extensions signed by "Jonathan Bullard", see Tunnelblick on macOS High Sierra and macOS Mojave.
On Apple Silicon Macs, macOS does not allow Tunnelblick to use its system extensions because they are not built for ARM processors. The developers plan to release a version of Tunnelblick which will enable the use of Tap configurations.
We're looking for volunteers to test new M1-compatible (we hope) system extensions (kexts) on M1 Macs. For this round of testing, you need to be comfortable using the command line and use Kext-Droplet-Big-Sur to load the kexts, which involves three restarts of your computer, then try them out in Tunnelblick 3.8.5beta02. Email email@example.com to get a link to download the new kexts. Please let us know which M1 Mac you have and what version of macOS Big Sur you will be using (for example, "11.0.1", "11.1", or "11.2 beta").
FEATURE: Tunnelblick disables loading of Tun and Tap system extensions.
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.) 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:
defaults delete net.tunnelblick.tunnelblick bigSurCanLoadKexts
WON'T FIX: Sidecar does not work when a VPN is connected using Tunnelblick's default for a configuration.
(This issue is not specific to Big Sur. It is present in all versions of Sidecar.)
Sidecar does not work if IPv6 is disabled. By default, Tunnelblick disables IPv6 while a VPN is connected. This is done to prevent information leaks in common VPN setups (see A Glance through the VPN Looking Glass: IPv6 Leakage and DNS Hijacking in Commercial VPN clients).
To fix this problem: