L2TP as follows from the name, is a layer 2 tunneling protocol. So, it can tunnel Layer 2 frames over IPSEC. I think it means that you can have ARP requests/replies and DHCP work over L2TP/IPSEC tunnel. Whereas usual IPSEC tunnel tunnels Layer 3, meaning you have to have separate subnets at both ends of the tunnel.
What’s the difference between lt2p and IPsec vpn?
L2TP as follows from the name, is a layer 2 tunneling protocol. So, it can tunnel Layer 2 frames over IPSEC. I think it means that you can have ARP requests/replies and DHCP work over L2TP/IPSEC tunnel. Whereas usual IPSEC tunnel tunnels Layer 3, meaning you have to have separate subnets at both ends of the tunnel.