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[Launchpad Bug Tracker <1633479@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package isc-dhcp - 4.2.4-7ubuntu12.8

---------------
isc-dhcp (4.2.4-7ubuntu12.8) trusty; urgency=medium

  * ipv6: wait for duplicate address detection to finish (LP: #1633479).

 -- Scott Moser <smoser@xxxxxxxxxx>  Mon, 31 Oct 2016 14:31:58 -0400

** Changed in: isc-dhcp (Ubuntu Trusty)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1633479

Title:
  dhclient does not wait for ipv6 dad (duplicate address detection)

Status in isc-dhcp package in Ubuntu:
  Fix Released
Status in isc-dhcp source package in Precise:
  Fix Committed
Status in isc-dhcp source package in Trusty:
  Fix Released
Status in isc-dhcp source package in Xenial:
  Fix Released
Status in isc-dhcp source package in Yakkety:
  Fix Committed

Bug description:
  dhclient -6 does not wait for an interface go through duplicate address detection.
  As a result the following will almost always fail:

   $ dev=eth0
   $ ip link set down dev $dev
   $ dhclient -6 -1 -v eth0
   Internet Systems Consortium DHCP Client 4.3.3
   Copyright 2004-2015 Internet Systems Consortium.
   All rights reserved.
   For info, please visit https://www.isc.org/software/dhcp/

   Can't bind to dhcp address: Cannot assign requested address
   Please make sure there is no other dhcp server
   running and that there's no entry for dhcp or
   bootp in /etc/inetd.conf.   Also make sure you
   are not running HP JetAdmin software, which
   includes a bootp server.

   If you think you have received this message due to a bug rather
   than a configuration issue please read the section on submitting
   bugs on either our web page at www.isc.org or in the README file
   before submitting a bug.  These pages explain the proper
   process and the information we find helpful for debugging..
   $ echo $?
   1

  Related bugs:
   * bug 1447715: dhclient -6: Can't bind to dhcp address: Cannot assign requested address
   * bug 1633562: 'dhclient -6 -S' does not bring interface up 

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: isc-dhcp-client 4.3.3-5ubuntu15
  ProcVersionSignature: Ubuntu 4.8.0-22.24-generic 4.8.0
  Uname: Linux 4.8.0-22-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Oct 14 09:18:52 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-23 (449 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150722.1)
  SourcePackage: isc-dhcp
  UpgradeStatus: No upgrade log present (probably fresh install)

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