That blog is a little excessive. It's just not that complicated.
Access your router via it's IP address (your "gateway address"), not the application interface and locate the DMZ settings. If it allows you to put in the MAC address of the 360 (or wireless adapter if you use that), find that on the network tab and put it in. Now ALL ports are open, no need for forwarding. If you have to put in an IP address (not all consumer routers allow you to input a MAC) then there is a catch: you have to assign your 360 a static IP (you set it to "manual" not "automatic" and use an IP address outside of the range of addresses used by the DHCP server in your router. If you leave it on automatic, in a few days the lease on this IP address to your 360 will expire and it could very well be assigned a different IP address by the router (DHCP server). That negates your DMZ setting, since the IP you have in the DMZ is no longer referring to your 360.
If you reflect as open, but someone else is moderate or strict, you're still likely to have issues with that person. Not your fault, they need to get to work on their situation.
If you set up the DMZ properly, but still show moderate/strict, if on DSL, then you need to look into your modem. DSL modems have a built in router, which could be screwing things up even if the rest of your network is set up correctly. You'll access it similarly to the router and it should have some basic settings to take care of this, usually a drop down box or something which lets you refer to Xbox Live.
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