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IPv6 and DNS – Getting your DNS infrastructure ready for IPv6

You can make your named network services available via IPv6 with a few simple steps.  First, your DNS server or DNS service provider should first hand out AAAA DNS records (pronounced quad-A record) which map hostnames to IPv6 addresses.  Second, you should provide PTR records to allow IPv6 Reverse DNS (rDNS) lookups.  Finally, you should take steps to make the DNS server itself reachable via IPv6.

Setup your DNS Server to start serving AAAA records

To allow resolution of hostnames to IPv6 addresses, your DNS Server must respond to requests for AAAA records.  Adding AAAA records to your forward zones will enable clients with IPv6 connectivity to learn the IPv6 addresses of your resources. Be aware there is a small risk that if a requesting client is among the minority with broken IPv6 connectivity, it can appear to the client that your website is down.  Some companies use DNS whitelisting to mitigate such issues, but there are concerns around that approach.

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