"Happy Eyeballs for Transport Selection". ^ Naeem, Khademi Anna, Brunstrom Per, Hurtig Karl-Johan, Grinnemo (July 21, 2016).^ OS X El Capitan implementation is biased towards ipv6 with a 25 ms headstart, previously from OS X Lion to OS X Yosemite it used the fastest connection with no protocol preference, according to Schinazi, David."getaddrinfo with round robin DNS and happy eyeballs". Happy Eyeballs Version 2: Better Connectivity Using Concurrency. "Happy Eyeballs: Improving User Experiences with IPv6 and SCTP" (PDF). ^ Wing, Dan Yourtchenko, Andrew (September 2010).The Happy Eyeballs algorithm may be extended for choosing between types of transport protocols as well, such as TCP and SCTP, but development is still in an experimental phase. Happy Eyeball testing was part of World IPv6 Day in 2011. Implementations of Happy Eyeballs stacks exist in Google's Chrome web browser, Opera 12.10, Firefox version 13, OS X, cURL and OpenBSD. The Happy Eyeballs (HE) algorithm, for instance, prevents bad user. Introduction In order to use applications over IPv6, it is necessary that users enjoy nearly identical. The IETF has developed protocols that promote a healthy IPv4 and IPv6 coexistence. The addresses are often chosen from the DNS with a round-robin algorithm. RFC 6555 Happy Eyeballs Dual Stack April 2012 1. An application that uses a Happy Eyeballs algorithm checks both IPv4 and IPv6 connectivity (with a preference for IPv6) and uses the first connection that is returned. Happy Eyeballs solves this problem by determining which transport would be better used for a particular connection by trying them both in parallel. Internet-Draft Happy Eyeballs Dual Stack December 2011 overall application operation, including harming the users experience with IPv6, which will slow the acceptance of IPv6, because IPv6 is frequently disabled in its entirety on the end systems to improve the user experience. Happy Eyeballs is designed to address the problem that many IPv6 networks are unreachable from parts of the Internet, and applications trying to reach those networks will appear unresponsive, thus frustrating users. The name "happy eyeballs" derives from the term "eyeball" to describe endpoints which represent human Internet end-users, as opposed to servers. Happy Eyeballs (also called Fast Fallback) is an algorithm published by the IETF that makes dual-stack applications (those that understand both IPv4 and IPv6) more responsive to users by attempting to connect using both IPv4 and IPv6 at the same time (preferring IPv6), thus minimizing common problems experienced by users with imperfect IPv6 connections or setups. Tcp4 192.168.0.10::443 4651 B 2196 B 79.12 ms 0.Algorithm for applications supporting both Internet protocol versions 4 and 6 Tcp4 192.168.0.10:49479104.244.42.66:443 5091 B 1648 B 17.72 ms 7.69 ms This patch invokes two socket connect()s nearly simultaneously, and the socket that is first connected wins and is. nettop -m tcp -J rtt_min,rtt_var,bytes_in,bytes_out -p 40893 Make sure to scroll to the right to see the bytes-in/bytes-out/round-trip-time by website/socket for the webkit process. The Happy Eyeballs concept means that the end user is kept as unaware as possible. I just want to show how cool this command is using preformatted text. IETF has defined the concept of 'Happy Eyeballs' around this issue 134. I don't remember the name of the tool, and have not been able to find it in macOS Catalina (10.15).ĭoes anyone remember the name of the MacOS CLI which shows the response-time by network destination?ĮDIT AFTER ANSWERED. I remember seeing a MacOS CLI which showed the recorded response times by destination. Some recent implementations also give a preference to IPv6 (I've heard of preferences from 25msec to 300msec). "Happy Eyeballs" is the IPv6 feature (RFC8305) where the OS tests response time on IPv4 and IPv6 per destination and tries to optimize performance by choosing the "fastest" protocol for hostnames which have both A-records and AAAA-records.
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