RFC6555 Happy Eyeballs and RFC8305 Happy Eyeballs 2
RFC6555 Happy Eyeballs: Success with Dual-Stack Hosts https://datatracker.ietf.org/doc/html/rfc6555 RFC3484 gives IPv6 addresses higher precedence than IPv4 addresses. Because of this when IPv6 connectivity is impaired, IPv6-capable applications incur many seconds of delay before falling back to IP…
