Yesterday all day I was unable to use my Xbox 360 online, turns out our PVR had taken the mac address from my Xbox. The only way I could get it working was to factory rest the router then turn on the Xbox, set up a static IP using DHCP reservation (which it already and has always had) and then turn on the PVR, if I turned on the PVR first or before I set the xbox's static IP it would take the Xbox's mac address.
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