DMZ and duplicate traffic

[dot1q]

I am currently in the process of dragging two public IP's to my house. My ISP has given me two, and one is currently in use to run my internal network. Everything works fine. Simple external interface with the IP. It passes traffic no problem. I have a third NIC that I installed to use as my DMZ. I added the second IP to the alias and placed the 'DMZ' interface to bridge to the external. I am trying to pass it through so I can run a server with a public IP. I do not wish to nat on my DMZ. The whole point with my setup is not to NAT. When I place the DMZ interface in bridge mode, I start getting phone calls and email alerts from the ISP's monitoring system, that duplicate traffic is being detected. It get's to the point where parts of the ISP cannot function because of the loop. This issue has had me scratching my head, and I am wondering if anyone else has tried my setup or something like what I am doing, and had these problems. Also if there is a solution to my setup or what I can do to fix it.

Thanks.

[WebFooL]

Hi,

If you bridge the DMZ inteface to the External you should not add the Alias to the External Interface.
You should give it to the Server that is connected to the DMZ Interface.

If you are createing a loop then it sounds like the DMZ and WAN interface are connected to the same switch with no separation? (Is that correct?)

A flowchart over your setup now and how you would like it to be would be good.