how to make interface as for transparent server after mikrot

Hello!
I have a questions that i didn’t found in forum…
How to make interface as bridge for transparent server after mikrotik??
I will put the put the Sonicwall(firewall) after mikrotik, but i can’t put with private IP. Because firewall create a VPN network with IP Publice and still connected with another network out office.

Give me a solution!


Thanks