For your Xbox, have you tried placing it in the DMZ? I had problems putting it in the DMZ with v23 (it would work for a while and after a month or two the Xbox would report moderate NAT again). However, it seems to be working fine since v24 RC3, I suggest you try it.
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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For your Xbox, have you tried placing it in the DMZ? I had problems putting it in the DMZ with v23 (it would work for a while and after a month or two the Xbox would report moderate NAT again). However, it seems to be working fine since v24 RC3, I suggest you try it.