Ping devices behind VPN client

[phate82]

Hi,
I started this docker container on my server. Then, I successfully connected a L2TP client (configured on a mikrotik mAP 2nD router) to the container. Now, the router running the L2TP client has three address classes (and two physical ethernet ports): one private address class (10.0.10.0/24) on the WAN interface that is connected to the horizontal wiring to get the Internet connection, one private address class (192.168.88.0/24) on the second ethernet port, and one private address 192.168.42.11 as VPN client (the VPN server has the 192.168.42.1 address). The VPN endpoints are able to ping each other and the clients on the 192.168.88.0/24 network are able to ping the VPN server endpoint (i.e. 192.168.42.1). Unfortunately, I can't ping the 192.168.88.0/24 network from the VPN server...do I have to change something on the VPN server configuration? or is this a VPN client issue?
Thanks

[phate82]

I solved by sending all the traffic to the VPN client address and then forwarding (with a NAT rule) the traffic to the proper destination basing on the destination port.