Internet Engineering Task Force G. Chen
Internet-Draft China Mobile
Intended status: Informational C. Williams
Expires: September 5, 2014 Consultant
D. Wing
A. Yourtchenko
Cisco Systems, Inc.
March 4, 2014
Happy Eyeballs Extension for Multiple Interfaces
draft-ietf-mif-happy-eyeballs-extension-04
Abstract
Currently the interface selection in multi-interface environment is
exclusive - only one interface can be used at the time, frequently
needing manual intervention. Happy Eyeballs in MIF would make the
selection process smoother by using the connectivity checks over a
pre-filtered interfaces according to defined policy. This would
choose "best" interface with an automatic fallback.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Problem Statement . . . . . . . . . . . . . . . . . . . . . . 3
3. Happiness Parameters . . . . . . . . . . . . . . . . . . . . 4
4. HE Behavior in MIF . . . . . . . . . . . . . . . . . . . . . 5
4.1. First Step, Filter . . . . . . . . . . . . . . . . . . . 6
4.2. Second Step, Sort . . . . . . . . . . . . . . . . . . . . 6
5. Implementation Framework . . . . . . . . . . . . . . . . . . 7
6. Additional Considerations . . . . . . . . . . . . . . . . . . 8
6.1. Usage Scope . . . . . . . . . . . . . . . . . . . . . . . 8
6.2. Fallback Timeout . . . . . . . . . . . . . . . . . . . . 8
6.3. DNS Selections . . . . . . . . . . . . . . . . . . . . . 9
6.4. Flow Continuity . . . . . . . . . . . . . . . . . . . . . 10
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 10
8. Security Considerations . . . . . . . . . . . . . . . . . . . 10
9. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 10
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 10
10.1. Normative References . . . . . . . . . . . . . . . . . . 10
10.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 11
1. Introduction
In multiple interface context, the problems raised by hosts with
multiple interfaces have been discussed. The MIF problem
statement[RFC6418] described the various issues when using a wrong
domain selection on a MIF node. Happy Eyeballs (HE) [RFC6555]
described how a dual-stack client can determine the functioning path
to a dual-stack server. It's using stateful algorithm to help
applications quickly determine if IPv6 or IPv4 is the most fast path
to connect a server. That is a good method to achieve smart path
selection. However, the assumption is a single-homed context. The
interaction with multiple interfaces is deferred for further study.
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