Tailscale with NordVPN at the same time on GNU/Linux

By default, NordVPN does not allow users to connect to Tailscale. This is because NordVPN blocks Tailscale traffic.

To solve this, you just need to execute the following commands:

nordvpn whitelist add subnet 100.64.0.0/10
nordvpn whitelist add subnet fd7a:115c:a1e0::/48
nordvpn whitelist add port 41641

Then, restart the NordVPN connection:

nordvpn d
nordvpn c US

Finally, if you are not connected to Tailscale, then connect to Tailscale:

sudo tailscale up --accept-routes --shields-up