Need expert in configuring Untangle as a bridge with existing firewall.

I downloaded an ISO image of Untangle (to be configured as a bridge) - It sounded very straight-forward (I thought), so I did.  Now I instralled it into system without any OS, so that Untangle can do its own work.  While doing the configuration, when it came to network installation, i.e., assigning IP address into it, our whole network system went down......big time.

There may be something wrong with my NIC cards connections?  Untangle requires at least two network cards.  So, I installed another NIC in addition to the internal NIC that's already onboard.  It only asked for one IP address which I assigned a static one.  Both NICs are attached into the same switch.
Now, where did it go wrong? and how do I fix them?  Right now, I have the switch and Untangle removed from the network (can't afford another system breakdown).....

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Michael WorshamStaff Infrastructure ArchitectCommented:
You need to setup the Untangle appliance in transparent bridge mode.

Untangle Quick Start Guide

Untangle Server as a Bridge

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