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Yes unless you want to have to unconnect and reconnect whatever you have plugged into the modem now. It's very simple as I had a Comcast modem also and went to Best buy and Purchased a wireless modem for $80 and later found I could have purchased the same or better equipment cheaper elsewhere. The modem gets plugged into the router and everything else that you need to go online gets plugged into the router or gets set up for wireless connection. I found that the PS3 held the connection perfectly when it was wired and so even though I purchased a wireless router I also purchased a 50 foot Belkin cat 6 gold ethernet cable on Ebay for $20 incl S/H and set up a wired connection.

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Q: If I have a Comcast modem do I need a router to connect my PS3 online?
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