Additional note for this bug: this has been "fixed" upstream by adding a --dad-wait-time parameter to dhclient. However, that param defaults to 0, and also requires an update to the dhclient-script.linux that isc- dhcp provides. Debian has its own modified dhclient-script.linux, slightly different than upstream, which is what we modified to fix this bug.
The upstream bug is: https://bugs.isc.org/Public/Bug/Display.html?id=36169 I don't personally recommend using the upstream isc-dhcp "fix" for this; our change to the dhclient-script.linux maintained by debian/ubuntu is a better fix, at least for the SRU releases; and our change doesn't require tooling that uses dhclient to add a new --dad-wait-time parameter. ** Bug watch added: bugs.isc.org/Public/ #36169 https://bugs.isc.org/Public/Ticket/Display.html?id=36169 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu. 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 Released 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 Released 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) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1633479/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
