Bridge mode...
By default Untangle with a 3rd interface will bridge the DMZ interface to External to make this a reality. You use a public address on your External interface, Internal provides the NAT and other features needed for the network to run normally. Then the DMZ interface extends the public IP space in to a server, or servers that are addressed as if they were online directly. Except, all traffic bound to them is still subject to the rack, so you can protect them.
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