OPEN ACCESS TO THE BROADBAND INTERNET TECHNICAL …

The Comcast combination wireless+modem will not allow you to enforce DNS filtering. However, if you choose to have two wireless access points (APs), you can use your modem’s built-in wireless as Mom/Dad’s wireless internet, and then put a DD-WRT, Tomato, or Gargoyle router behind the Comcast modem+router for the kid(s) filtered internet ... ................
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