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DHCP issue when using 3rd Party Bridge

I have a WLC 4404 running I have 20 1522's currently and all seems to be working great until I try to connect a client through a bridge device. The end device cannot obtain an IP address via DHCP, the request goes out, but the response is never received.

The bridge device is functioning correctly because if I assign a static IP to the client in the correct subnet it passes traffic no problem.

I've looked at the workgroup bridge functionality but that looks like it only works when using a cisco device on the 'client' end. In my application (WISP) I don't want or need Cisco AP's at every client location.

It doesn't make sense to me why a 3rd party bridge will work fore seemingly all traffic accept DHCP assignments. Any help would be appreciated.

I have read many posts on these forums that discuss this same subject but none seem to have definitive answers.