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Happy Eyeballs Version 2: Better Connectivity Using Concurrency
RFC 8305

Approval announcement
Draft of message to be sent after approval:


From: The IESG <>
To: IETF-Announce <>
Cc: Ron Bonica <>,, The IESG <>,,,,,
Subject: Protocol Action: 'Happy Eyeballs Version 2: Better Connectivity Using Concurrency' to Proposed Standard (draft-ietf-v6ops-rfc6555bis-07.txt)

The IESG has approved the following document:
- 'Happy Eyeballs Version 2: Better Connectivity Using Concurrency'
  (draft-ietf-v6ops-rfc6555bis-07.txt) as Proposed Standard

This document is the product of the IPv6 Operations Working Group.

The IESG contact persons are Warren Kumari and Benoit Claise.

A URL of this Internet Draft is:

Ballot Text

Technical Summary

  Many communication protocols operated over the modern Internet use
  host names.  These often resolve to multiple IP addresses, each of
  which may have different performance and connectivity
  characteristics.  Since specific addresses or address families (IPv4
  or IPv6) may be blocked, broken, or sub-optimal on a network, clients
  that attempt multiple connections in parallel have a higher chance of
  establishing a connection sooner.  This document specifies
  requirements for algorithms that reduce this user-visible delay and
  provides an example algorithm.

Working Group Summary

  Strong WG consensus was achieved within six months of document introduction.
  After WGLC and IETF LC, the authors let the chairs (and me) know that they just
  realized that there *might* be associated IPR, and wanted to provide as much notice
  as possible. I held the document while they investigated / discussed with lawyers,
  and an IPR disclosure has since been filed (

Document Quality

  The current versions of macOS (Sierra) and iOS (10) implement the Happy Eyeballs V2 spec 
  as described. 


  Ron Bonica is the document shepherd
  Warren Kumari is the responsible AD

RFC Editor Note