One step that many people forget, or disregard, that is the most important step is to set up a static local IP on your computer. You need to tell your router what your IP is, not allow your router to use DHCP and give you some random local IP. Here are the steps for a Mac:
http://www.portforward.com/networkin...ic-Mac10.4.htm
(It doesn't look like the OP is using Comcast, so I don't think this is a Sandvine problem.)
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