OpenDNS Content Filtering. For most networks, OpenDNS Basic is sufficient. This free version of OpenDNS will display the ad-backed OpenDNS Guide when pages are blocked or when DNS errors occur (e.g. domain not found). For information on the different OpenDNS plans, click here. Implementation is easy.
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Content Filtering Not Working – OpenDNS
DNS filtering services, like OpenDNS, can effectively block domains by providing a DNS reply containing an alternate IP address that takes the browser to a "site is blocked" page. To a user entering a website into browser, the distinction between a URL and a domain name can be easily lost.