vpn server behind opnsense firewall

[reedone816]

hello new here,

my topology is internet -- opnsense firewall -- mikrotik l2tp/ipsec vpn server

i've created port forwarding on port 4500, 500 and ipsec-esp
looking the firewall log, there were traffic forwarding for port 4500 and 500 when i test the connection.
but from the mikrotik log only two line informations:

respond new phase 1 [500]...
ISAKMP-SA established [4500]...

the supposedly information of the "first L2TP UDP packet received from ..." never shown in the mikrotik log.

if i tries to connect to mikrotik from device from the same lan it connects, so nothing wrong in the vpn server side i presume.

can anyone tells me what to do?

thanks