--- 1/draft-ietf-6man-enhanced-dad-00.txt	2012-09-06 18:14:17.729508795 +0200
+++ 2/draft-ietf-6man-enhanced-dad-01.txt	2012-09-06 18:14:17.753511045 +0200
@@ -1,26 +1,26 @@
 
 Network Working Group                                           R. Asati
 Internet-Draft                                                  H. Singh
 Updates: 4862 (if approved)                                    W. Beebee
 Intended status: Standards Track                     Cisco Systems, Inc.
-Expires: October 8, 2012                                         E. Dart
+Expires: March 10, 2013                                          E. Dart
                                               Lawrence Berkeley National
                                                               Laboratory
                                                                W. George
                                                        Time Warner Cable
                                                             C. Pignataro
                                                      Cisco Systems, Inc.
-                                                           April 6, 2012
+                                                       September 6, 2012
 
                   Enhanced Duplicate Address Detection
-                  draft-ietf-6man-enhanced-dad-00.txt
+                  draft-ietf-6man-enhanced-dad-01.txt
 
 Abstract
 
    Appendix A of the IPv6 Duplicate Address Detection (DAD) document in
    RFC 4862 discusses Loopback Suppression and DAD.  However, RFC 4862
    does not settle on one specific automated means to detect loopback of
    Neighbor Discovery (ND of RFC 4861) 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
    includes mitigation techniques and then outlines the Enhanced DAD
@@ -38,21 +38,21 @@
    Internet-Drafts are working documents of the Internet Engineering
    Task Force (IETF).  Note that other groups may also distribute
    working documents as Internet-Drafts.  The list of current Internet-
    Drafts is at http://datatracker.ietf.org/drafts/current/.
 
    Internet-Drafts are draft documents valid for a maximum of six months
    and may be updated, replaced, or obsoleted by other documents at any
    time.  It is inappropriate to use Internet-Drafts as reference
    material or to cite them other than as "work in progress."
 
-   This Internet-Draft will expire on October 8, 2012.
+   This Internet-Draft will expire on March 10, 2013.
 
 Copyright Notice
 
    Copyright (c) 2012 IETF Trust and the persons identified as the
    document authors.  All rights reserved.
 
    This document is subject to BCP 78 and the IETF Trust's Legal
    Provisions Relating to IETF Documents
    (http://trustee.ietf.org/license-info) in effect on the date of
    publication of this document.  Please review these documents
@@ -179,21 +179,22 @@
    One can disable DAD on an interface and then there is no NS(DAD)
    issued to be looped back.  DAD is disabled by setting the interface's
    DupAddrDetectTransmits variable to zero.  While this mitigation may
    be the simplest the mitigation has three drawbacks.
 
    It would likely require careful analysis of configuration on such
    point-to-point interfaces, a one-time manual configuration on each of
    such interfaces, and more importantly, genuine duplicates in the link
    will not be detected.
 
-   A network operator MAY use this mitigation.
+   A Service Provider router such as an access concentrator or network
+   core router SHOULD support this mitigation strategy.
 
 3.2.  Dynamic Disable/Enable of DAD Using Layer 2 Protocol
 
    It is possible that one or more layer 2 protocols include provisions
    to detect the existence of a loopback on an interface circuit,
    usually by comparing protocol data sent and received.  For example,
    PPP uses magic number (section 6.4 of [RFC1661]) to detect a loopback
    on an interface.
 
    When a layer 2 protocol detects that a loopback is present on an