alt Hacker NewsAAAA record resolution is the real bottleneck for adoption. Once you have dual stack working, I did a real-world, simple test: Release your ISP IPv4 DHCP lease on the router (kill udhcpc) and flush DNS on your hosts. Now all public DNS lookups must resolve to a IPv6 domain. You will very quickly find many domains on the Internet still don't have AAAA records. Lots of popular services will simply fail to resolve their hard coded domains. QED.