VPN IPSec on Peplink

Hello,

I am setting up an IPsec VPN between a Peplink device and a Teltonika router. Currently, the tunnel is up on both sides.

I am testing connectivity using the ping tool in the Web UI on both devices.

Case 1: Ping from Teltonika → Peplink LAN: OK
Case 2: Ping from Peplink → Teltonika LAN: Not OK
Case 3: Ping from a PC behind Peplink → Teltonika LAN: OK

For Case 2, is it correct that the ping fails because the Peplink Web UI ping tool does not use the IPsec interface as the source interface?

Thanks