I got forwarding of ipip to my Ras-Pi. I'm doing exactly what you're saying here Brian, separating my gateway and my router. I already see traffic on the DMZ interface on the RasPi so I need to apply what I learned last year and get my scripting going.
--tom
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It's probably better to configure some small appliance-grade processor (such as a Raspberry Pi) with some variety of Linux to take advantage of its secondary routing table mechanism rather than try to kludge it in to some other kind of router
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