Hello.
I don’t know if this is the same on Linux, but on windows when you install ZeroTier and create/connect to network, the ZeroTier adapter has automatic metric, which is always bigger then ethernet LAN.
So e.g. broadcast packets (from game LAN server search) goes directly to ethernet instead to ZeroTier.
Would be great if the created adapter would have automatically set metric to 1, so the packets goes to ZeroTier first.