Also, you didn't reveal who set it up or the settings. Tell more or I fear you'll have to let Comcast fix ti.
My computer often has trouble connecting to the internet. It will either connect to the router but not the internet, or it will keep connecting and disconnecting to/from the router.
When my roommate turns on her computer and connects it to the internet, suddenly my computer connects without further problems.
Any ideas why this might be?
I'm using Ubuntu, she's using Windows, and we're both connecting to comcast wifi.