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Since RFC 6555 published, research papers, for example, Measuring the Effects of Happy Eyeballs, depict improvement space for the RFC. In addition, network or service operators speak up that the race is not only for TCP connection setup but for DNS query handling. RFC 8305 Happy Eyeballs version 2 addresses such issues.
To summarize, version 2 clarifies the existing algorithm, modifies the configurable variable values for performance improvement and adds consideration for various circumstances such as IPv6-IPv4 transition and VPN. Luckily, there's no significant user-visible behavioral change.
I'd like to propose to replace the existing RFC 6555 implementation with RFC 8305 implementation after landing dns/dnsmessage package (#16218).
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