A small executable that will enforce DNS server settings every 5 minutes for basic users (such as my kids) to have a safer online experience when used with a good DNS filtering service. Works between all networks (home, school, work, trips, etc) since it's local and protects against unintended and/or unwanted DNS changes from malware. Use as elevated user, e.g. Administrator.
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Norton ConnectSafe, OpenDNS Family Shield, etc. are good services to use to prevent traffic to malware-, porn- and other potentially unwanted Internet sites. OpenDNS lets you configure your own sites and useful customization with their free Home solution.