Public bug reported:

dhclient -6 does not wait for an interface go through duplicate address 
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
 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 or in the README file
 before submitting a bug.  These pages explain the proper
 process and the information we find helpful for debugging..
 $ echo $?

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)

** Affects: isc-dhcp (Ubuntu)
     Importance: Medium
     Assignee: Scott Moser (smoser)
         Status: Fix Committed

** Tags: amd64 apport-bug yakkety

** Changed in: isc-dhcp (Ubuntu)
   Importance: Undecided => Medium

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

** Changed in: isc-dhcp (Ubuntu)
     Assignee: (unassigned) => Scott Moser (smoser)

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

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