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    • CommentAuthorelnen101
    • CommentTimeJan 24th 2013
    Recently one of my kids has discovered the vulnerability opendns to use Google DNS and ..
    How could protect from the router, a Comtrend AR-5387un, to not pass blocking?.
    I can not protect every PC individually because they use tabletts, smartphones, etc
    • CommentAuthormaintenance
    • CommentTimeJan 24th 2013 edited
    This is maybe your device?
    It may depend on the ISP firmware as to what you can do.

    here's the manufacturer site

    See 5.5.1 IP Filtering

    Source IP range: /0
    Source port: 1:65535
    Destination port: 53
    Protocol: TCP/UDP
    Destination IP: Your Google and other DNS server IPs

    edit: This, of course, only accounts for bypassing OpenDNS by using alternate DNS servers. Users who are administrators of their machines have a thousand other ways.
  1.  permalink
    What you describe isn't an OpenDNS vulnerability. If the devices aren't using the router's DNS (set to OpenDNS), they aren't covered by OpenDNS.

    For the kids PCs, lock-down Admin privileges. Despite what they might tell you, no user needs to surf as Admin. If you want to control content (i.e. blocking) you have to restrict Admin access.

    Smartphones/Tablets: if they have cellular access, they can bypass your router. For iPhones and laptops, consider Umbrella (

    I have limited experience with Tablets, so you need to research further.

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