I've set up OpenVPN and have successfully connected from my remote PC into my Tunnelled network 10.0.1.0/24. My remote device can access the wider WAN through the VPN perfectly.
I can ping the LAN IP address of the OPNSense devices 10.0.0.1 and also 10.0.1.1 from my remote device.
However I cannot ping or reach any other devices on the LAN such as 10.0.0.100 from my remote device.
LAN IP 10.0.0./24
OpenVPN 10.0.1.0/24
I'm sure that I'm missing something fundamental regarding routing between the two subnets but I just don't know where to start.
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Do the devices on your LAN have OPNsense as their default gateway? If not, you'll need to add a static route (manually or by DHCP) for 10.0.1.0/24 via 10.0.0.1
Since you can get out the WAN, I suspect that your tunnel is set up to push redirect-gateway to your remote devices already.
You can NAT the local end of your tunnel onto your LAN but that's messy.
Bart...
sounds like firewall rules not yet allowing access from OpenVPN to LAN - https://docs.opnsense.org/manual/how-tos/sslvpn_client.html