If you don’t know your DNS server is valid, you need to find out before July 9. The FBI found rogue DNS servers and replaced them with clean, safe DNS servers to protect the public. These safe, clean servers will be turned off on July 9, 2012. If your computer was compromised to use the rogue servers, it will stop resolving DNS queries on July 9 when the clean servers are turned off. The FBI has provided full technical details at http://www.fbi.gov/news/stories/2011/november/malware_110911/DNS-changer-malware.pdf. This document lists the IP addresses of the rogue servers. The rogue servers were taken down. The clean servers use the same IP addresses that the rogue servers did. When the clean servers are decommissioned, compromised machines will be pointing to nowhere and thus be unable to resolve names. Of course, browsing by IP address will work without a DNS server. You can check the status of your machine by browsing to this address: http://www.dns-ok.us/.
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About John Paul Cook
John Paul Cook is both a Registered Nurse and a Microsoft SQL Server MVP experienced in Microsoft SQL Server and Oracle database application design, development, and implementation. He has spoken at many conferences including Microsoft TechEd and the SQL PASS Summit. He has worked in oil and gas, financial, manufacturing, and healthcare industries. Experienced in systems integration and workflow analysis, John is passionate about combining his IT experience with his nursing background to solve difficult problems in healthcare. He sees opportunities in using business intelligence to satisfy healthcare meaningful use requirements and improve patient outcomes. Contributing author to SQL Server MVP Deep Dives
and SQL Server MVP Deep Dives Volume 2