Troubleshooting registration of IPv6 addresses in DNS

by Mitch Tulloch [Published on 1 Aug. 2012 / Last Updated on 1 Aug. 2012]

How to troubleshoot a scenario where IPv6 addresses are unexpectedly being registered on your DNS servers.

Scenario: You're seeing lots of AAAA records being registered on your DNS servers.  Since these records are registrations for IPv6 addresses, you're wondering why this is happening.

Suggestion: IPv6 addresses will only be registered in DNS if the computers have public IPv4 addresses assigned. This triggers the computers to activate 6to4 and these 6to4 addresses will then be registered in DNS.  If the computers don't have public IPv4 addresses, no IPv6 addresses will be registered for them in DNS.

Mitch Tulloch is a seven-time recipient of the Microsoft Most Valuable Professional (MVP) award and widely recognized expert on Windows administration, deployment and virtualization. For more tips by Mitch you can follow him on Twitter or friend him on Facebook.

The Author — Mitch Tulloch

Mitch Tulloch is a widely recognized expert on Windows administration, networking, and security. He has been repeatedly awarded Most Valuable Professional (MVP) status by Microsoft for his outstanding contributions in supporting users who deploy and use Microsoft platforms, products and solutions. Mitch has published over two hundred articles on different IT websites and magazines, and he has written or contributed to almost two dozen books and is lead author for the Windows 7 Resource Kit from Microsoft Press. For more information, see .

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