draft-ietf-6man-enhanced-dad-13.txt   draft-ietf-6man-enhanced-dad-14.txt 
Network Working Group R. Asati Network Working Group R. Asati
Internet-Draft H. Singh Internet-Draft H. Singh
Updates: 4862, 4861, 4429 (if approved) W. Beebee Updates: 4862, 4861, 4429 (if approved) W. Beebee
Intended status: Standards Track C. Pignataro Intended status: Standards Track C. Pignataro
Expires: August 10, 2015 Cisco Systems, Inc. Expires: September 4, 2015 Cisco Systems, Inc.
E. Dart E. Dart
Lawrence Berkeley National Laboratory Lawrence Berkeley National Laboratory
W. George W. George
Time Warner Cable Time Warner Cable
February 6, 2015 March 3, 2015
Enhanced Duplicate Address Detection Enhanced Duplicate Address Detection
draft-ietf-6man-enhanced-dad-13 draft-ietf-6man-enhanced-dad-14
Abstract Abstract
IPv6 Loopback Suppression and Duplicate Address Detection (DAD) are IPv6 Loopback Suppression and Duplicate Address Detection (DAD) are
discussed in Appendix A of RFC4862. That specification mentions a discussed in Appendix A of RFC4862. That specification mentions a
hardware-assisted mechanism to detect looped back DAD messages. If hardware-assisted mechanism to detect looped back DAD messages. If
hardware cannot suppress looped back DAD messages, a software hardware cannot suppress looped back DAD messages, a software
solution is required. Several service provider communities have solution is required. Several service provider communities have
expressed a need for automated detection of looped back Neighbor expressed a need for automated detection of looped back Neighbor
Discovery (ND) messages used by DAD. This document includes Discovery (ND) messages used by DAD. This document includes
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on August 10, 2015. This Internet-Draft will expire on September 4, 2015.
Copyright Notice Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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network interface of an IPv6 node for DAD. Another message involved network interface of an IPv6 node for DAD. Another message involved
in DAD is the Neighbor Advertisement (NA). The Enhanced DAD in DAD is the Neighbor Advertisement (NA). The Enhanced DAD
algorithm specified in this document focuses on detecting an NS algorithm specified in this document focuses on detecting an NS
looped back to the transmitting interface during the DAD operation. looped back to the transmitting interface during the DAD operation.
Detecting a looped back NA does not solve the looped back DAD Detecting a looped back NA does not solve the looped back DAD
problem. Detection of any other looped back ND messages during the problem. Detection of any other looped back ND messages during the
DAD operation is outside the scope of this document. This document DAD operation is outside the scope of this document. This document
also includes a section on Mitigation that discusses means already also includes a section on Mitigation that discusses means already
available to mitigate the DAD loopback problem. This document available to mitigate the DAD loopback problem. This document
updates RFC4861, RFC4862, and RFC4429. updates RFC4861, RFC4862, and RFC4429. This document updates RFC
4862 and RFC 4429 to use the enhanced-dad algorithm to detect looped
back DAD probes. The Changes to RFC 4861 section includes an update
to RFC 4861.
1.1. Requirements Language 1.1. Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119]. document are to be interpreted as described in [RFC2119].
1.2. Terminology 1.2. Terminology
o DAD-failed state - Duplication Address Detection failure as o DAD-failed state - Duplication Address Detection failure as
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