Enhanced Duplicate Address Detection (RFC7527)
Original Publication Date: 2015-Apr-01
Included in the Prior Art Database: 2015-Apr-25
Internet Society Requests For Comment (RFCs)
R. Asati: AUTHOR [+5]
IPv6 Loopback Suppression and Duplicate Address Detection (DAD) are discussed in Appendix A of [RFC4862]. That specification mentions a hardware-assisted mechanism to detect looped back DAD messages. If hardware cannot suppress looped back DAD messages, a software solution is required. One specific DAD message is the Neighbor Solicitation (NS), specified in [RFC4861]. The NS is issued by the network interface of an IPv6 node for DAD. Another message involved in DAD is the Neighbor Advertisement (NA). The Enhanced DAD algorithm specified in this document focuses on detecting an NS looped back to the transmitting interface during the DAD operation. Detecting a looped back NA does not solve the looped back DAD
Internet Engineering Task Force (IETF) R. Asati Request for Comments: 7527 H. Singh Updates: 4429, 4861, 4862 W. Beebee Category: Standards Track C. Pignataro ISSN: 2070-1721 Cisco Systems, Inc. E. Dart Lawrence Berkeley National Laboratory W. George Time Warner Cable April 2015
Enhanced Duplicate Address Detection
IPv6 Loopback Suppression and Duplicate Address Detection (DAD) are discussed in Appendix A of RFC 4862. That specification mentions a hardware-assisted mechanism to detect looped back DAD messages. If hardware cannot suppress looped back DAD messages, a software solution is required. Several service provider communities have expressed a need for automated detection of looped back Neighbor Discovery (ND) messages used by DAD. This document includes mitigation techniques and outlines the Enhanced DAD algorithm to automate the detection of looped back IPv6 ND messages used by DAD. For network loopback tests, the Enhanced DAD algorithm allows IPv6 to self-heal after a loopback is placed and removed. Further, for certain access networks, this document automates resolving a specific duplicate address conflict. This document updates RFCs 4429, 4861, and 4862.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force (IETF). It represents the consensus of the IETF community. It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG). Further information on Internet Standards is available in Section 2 of RFC 5741.
Information about the current status of this document, any errata, and how to provide feedback on it may be obtained at http://www.rfc-editor.org/info/rfc7527.
al. Standards Track [Page 1]
RFC 7527 Enha...