EPSXe how to fix multiplayer?

Question

Computer networks

Good day everyone. Downloaded ePSXe , decided to play with friends on the network.
VPN was raised, pptpd on a linux server with encryption disabled. But the problem is that when starting multiplayer, ePSXe expects connection not from vpn, but from the main ethernet. I thought that it was a matter of priority, received priorities

Get-NetIPInterface

and changed the priority of vpn, the lower, the higher the priority.

Set-NetIPInterface -InterfaceIndex 13 -InterfaceMetric 1

But the epsxe emulator does not care, it still listens to ethernet. How to be? There is no way to force it, it is not clear how this software selects the connection that needs to be listened to.

PS It works through zerotier , but there are sublags and delays. and the emulator listens to the created zerotier adapter, where is the justice?!)