[Mac] Tailscale Support

[auckenox]

I had Beta 1 running with Tailscale over Direct-Connect, it worked fine.
Now i updated to Beta 16 and its not working anymore.
I can't choose my tailscale IP anymore in "Options -> LAN-IP" and it doesn't work anymore over Direct-Connect. The error is: connection timed out.
Maybe this will be possible again sometimes in the future?

Thank you all so much for the great work!

[arazmj]

This looks like a real interface-selection bug, not a mistake in your setup. On macOS, Tailscale uses a utun interface, and the current IP enumeration filters utun/point-to-point interfaces—so its address cannot appear in LAN-IP. Direct Connect itself can work over VPNs; we have tested ZeroTier cross-platform. The filter needs a safe exception for selectable VPN IPv4 addresses.