Happy Eyeballs

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A product of the Internet Engineering Task Force (IETF) Internet Protocol version 6 Operations Working Group (v6ops), Happy Eyeballs is a mechanism that lets Web (i.e., HTTP_ applications to determine if IPv4 or IPv6 connectivity will give better performance. The applications will learn to prefer the method that works best, so it need not probe each time to find the path. Happy Eyeballs is intended to ease the transition from IPv4 to IPv6, using hosts with stacks for both protocols/ [1]

Performance testing for the mechanism is being defined by the Benchmarking Methodology Working Group (BMWG).


  1. Dan Wing and Andrew A. Yourtchenko (25 October 2010), Happy Eyeballs: Trending Towards Success with Dual-Stack Hosts, draft-wing-v6ops-happy-eyeballs-ipv6-01