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SonicWall blocks valid WAN IPs as "IP spoof"

Last Modified: 2013-12-14
Our SonicWall TZ190 blocks some important and legitimate WAN-to-LAN traffic just because the incoming IP sources are similar to our OPTional WAN IP (which is a dynamic IP, not a static one) . For example, outside WAN 74.130.X.Y is blocked as an "IP Spoof" because our OPTional WAN IP is 74.130.Y.X.  (I'm not a network expert, so please forgive my simple explanation.)

Unfortunately, the TZ190 doesn't provide an easy or obvious way to solve this problem, at least not for me.

Does anyone know of a solution? Could I configure rules that would work around the false positives in spoof-detection? Could I connect the OPTional WAN modem to another router and then to the SonicWall? If so, how so? Can incoming traffic be forced through our Primary Wan (which IS a static IP and works fine)?

Any suggestions would be greatly appreciated; I'm on the hook for this at a new place of employment.
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