I'm sorry I have no idea what you're talking about?? DMZ??? my net duma router is plugged in & set up in accordance with your set up instructions. It has been working fine up until 1 month ago where I cannot access any side headings on your page to change my geo filter, Im trying to upgrade & im trying to jump through your hoops but when you say make sure your R1?? is in the DMZ of your router?? I have no idea what your talking about. I just want my netduma to work & for £150 I don't think that's unreasonable