Here is my situation.

I have a working site to site l2tp ipsec configuration between 2 mikrotik routers in producion env.
I can ping and reach pc and services in both ends of the tunnel.

Server lan 192.168.1 0/24
Server l2tp tunnel 172.19.20.1

Client lan 192.168.2.0/24
Client l2tp tunnel 172.19.20.51

Today i installed an OSSEC monitoring agent on a client side pc to report back at the server side pc.

The pc from the server side .1.1 says that the connection is coming from 192 168.1.1 and not from the agent ip 192.168.2.20.

Im not a mikrotik pro so help me out what im missing here.