Accesing the modem behinde ROS hotspot

Hi guys
I have just set up MT with hotspot and all is working fine.
Now,
I have a server on my local network that need to accees the modem behid the MT box.
What I want the MT to do is to just forward all pakets from this server directly to the modem without NAT without Hotspot.
The server uses real IP but right now the hotspot will not just let it do any thing.
I want this server to just pass throught the MT to the modem.
Please bail me out.
Thank in adv

You can add entries in hotspot-walled garden to bypass hotspot for specific devices.

Thankx mrs
I want to bypass the entire Microtik box not only the Hotspot.
Will walled-garden do that?