TAP tunnel routing failing
I've set up an OpenVPN in TAP mode as I need on both sides the same subnet.
OpenVPN runs over UDP and the tunnel is always connected.
but I cannot always ping. after a few minutes, it works again.
it seems very unstable but not a lot of traffic is passing.
is there anything special I should watch out for?
Your Config is wrong, check https://docs.netgate.com/pfsense/en/latest/book/openvpn/bridged-openvpn-connections.html and follow the steps.