Connected to L2TP but cannot pass traffic

Ensure firewall rules have been added to the L2TP VPN interface .

Also ensure the remote subnet across the VPN is different from the local subnet. It is not possible to reach a 192.168.1.0/24 network across the VPN when the local subnet where the client resides is also 192.168.1.0/24, traffic destined for that subnet will never traverse the VPN because it is on the local network. This is why it is important to choose a relatively obscure LAN subnet when using a VPN.