Then you're shitty American ISP throttle you for too many downloads. Fuck I hate Comcast, and no they are not fooling anyone changing their name to Xfinity.
The xfi gateway ($20/month) gives you unlimited / no caps, but you have to have their gateway. Otherwise it's $30/month for unlimited without their gateway.
The gateway can have the bridge mode turned on quite easily through the Xfinity website.