Thanks for the explanation Tony, very informative! smile

Your setup resembles mine, with one exception: because of my specific request, my ISP didn't install a modem/router docsis 3 cable modem, but just a 'dumb' docsis 3 modem. That way I'm sure there isn't any double NAT'ing going on. Took some convincing since isp's don't like to install those (because they can't support them remotely), but I managed to get one in the end.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup