Did you manage to get this working dude? I am having the exact same problem, I have everything configured but it’s not doing anything apart from crash and go to the main men after about 10 seconds
It's hit or miss, and often miss. It's down to the US configuration protocols, they are largely useless (at least on a system that also uses Dreamkey). My experience is that you might be lucky enough to get the US config working (though that is hit-or-miss regardless of DMZ, IP or anything else) but it'll kill your Dreamkey config. If you config through Dreamkey, the entire library works bar a few PlanetWeb specific titles, and trying to reconfig for them usually kills your Dreamkey protocols and only works on PlanetWeb specific titles about half the time.
So I bought a modem from DreamcastLive with a built-in DC-DC booster board back several months ago and just got around to testing it yesterday, sadly...
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I went over to my mom's house for Mother's Day and actually managed to find an old Lenovo USB modem I had with the Conexant chipset. I hooked it up...