Broadband access folks, Of particular interest to you in this document will be this problem from the Introduction section.
[In another service provider network, two broadband modems in a home have the Ethernet ports of each modem connected to a network hub. The access concentrator serving the modems is the first-hop IPv6 router for the modems. The access concentrator also supports proxying of DAD messages. Each modem is IPv4 online. The network interface of the access concentrator serving the two broadband modems is enabled for IPv6 and the interface issues a NS(DAD) message for the IPv6 link- local address. The NS message reaches one modem first and this modem sends the message to the hub which sends the message to the second modem which forwards the message back to the access concentrator. The looped back NS message causes the network interface on the access concentrator to be in a DAD-failed state. Such a network interface typically serves over six thousand broadband modems causing all the modems (and hosts behind the modems) to fail to get IPv6 online on the access network. Additionally, it may be tedious for the access concentrator to find out which of the six thousand or more homes looped back the DAD message. Clearly there is a need for automated detection of looped back NS messages during DAD operations by a node.] Hemant -----Original Message----- From: ipv6-boun...@ietf.org [mailto:ipv6-boun...@ietf.org] On Behalf Of Hemant Singh (shemant) Sent: Friday, October 14, 2011 11:45 AM To: IPv6 WG Mailing List Subject: FW: New Version Notification for draft-hsingh-6man-enhanced-dad-01.txt Folks, Please review this document. Thanks, Hemant -----Original Message----- From: internet-dra...@ietf.org [mailto:internet-dra...@ietf.org] Sent: Friday, October 14, 2011 11:26 AM To: Hemant Singh (shemant) Cc: Hemant Singh (shemant) Subject: New Version Notification for draft-hsingh-6man-enhanced-dad-01.txt A new version of I-D, draft-hsingh-6man-enhanced-dad-01.txt has been successfully submitted by Hemant Singh and posted to the IETF repository. Filename: draft-hsingh-6man-enhanced-dad Revision: 01 Title: Enhanced Duplicate Address Detection Creation date: 2011-10-14 WG ID: Individual Submission Number of pages: 7 Abstract: Appendix A of [RFC4862] discusses Loopback Suppression and Duplicate Address Detection (DAD). However, [RFC4862] does not settle on one specific automated means to detect Loopback of Neighbor Discovery (ND) [RFC4861] messages used by DAD. Several service provider communities have expressed a need for automated detection of looped backed ND messages used by DAD. This document outlines an algorithm to automate detection of looped back IPv6 ND messages used by DAD. Further, for certain access networks the document automates resolving a specific duplicate address conflict. The IETF Secretariat -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 -------------------------------------------------------------------- -------------------------------------------------------------------- IETF IPv6 working group mailing list ipv6@ietf.org Administrative Requests: https://www.ietf.org/mailman/listinfo/ipv6 --------------------------------------------------------------------
