I can also confirm trusty and precise as shown above. They behave differently, in that instead of exiting failure, dhclient actually tries again and ends up getting an address. So in precise you would see:
| # dhclient -6 -1 -v $dev | Internet Systems Consortium DHCP Client 4.1-ESV-R4 | Copyright 2004-2011 Internet Systems Consortium. | All rights reserved. | For info, please visit https://www.isc.org/software/dhcp/ | | Bound to *:546 | Listening on Socket/eth0 | Sending on Socket/eth0 | PRC: Confirming active lease (INIT-REBOOT). | | XMT: Forming Confirm, 0 ms elapsed. | XMT: X-- IA_NA 3e:28:e6:37 | XMT: | X-- Confirm Address fd42:198e:d2a5:1d10:1e4c:ac80:7f2e:f59e | XMT: V IA_NA appended. | XMT: Confirm on eth0, interval 920ms. | send_packet6: Cannot assign requested address | dhc6: sendpacket6() sent -1 of 84 bytes | [***** short pause here *****] | XMT: Forming Confirm, 920 ms elapsed. | XMT: X-- IA_NA 3e:28:e6:37 | XMT: | X-- Confirm Address fd42:198e:d2a5:1d10:1e4c:ac80:7f2e:f59e | XMT: V IA_NA appended. | XMT: Confirm on eth0, interval 1910ms. | send_packet6: Cannot assign requested address | dhc6: sendpacket6() sent -1 of 84 bytes | [***** short pause here *****] | XMT: Forming Confirm, 2830 ms elapsed. | XMT: X-- IA_NA 3e:28:e6:37 | XMT: | X-- Confirm Address fd42:198e:d2a5:1d10:1e4c:ac80:7f2e:f59e | XMT: V IA_NA appended. | XMT: Confirm on eth0, interval 3710ms. | RCV: Reply message on eth0 from fe80::3896:5cff:fe61:baf0. | RCV: X-- Server ID: 00:01:00:01:1f:c5:e1:fb:b8:ae:ed:75:5f:9a | message status code Success: "all addresses still on link" | PRC: Bound to lease 00:01:00:01:1f:c5:e1:fb:b8:ae:ed:75:5f:9a. After the fix you see: | # dhclient -6 -1 -v $dev | Internet Systems Consortium DHCP Client 4.1-ESV-R4 | Copyright 2004-2011 Internet Systems Consortium. | All rights reserved. | For info, please visit https://www.isc.org/software/dhcp/ | | Bound to *:546 | Listening on Socket/eth0 | Sending on Socket/eth0 | PRC: Confirming active lease (INIT-REBOOT). | | XMT: Forming Confirm, 0 ms elapsed. | XMT: X-- IA_NA 3e:28:e6:37 | XMT: | X-- Confirm Address fd42:198e:d2a5:1d10:1e4c:ac80:7f2e:f59e | XMT: V IA_NA appended. | XMT: Confirm on eth0, interval 920ms. | send_packet6: Cannot assign requested address | dhc6: sendpacket6() sent -1 of 84 bytes So I'm marking this fixed on precise and trusty also as we fix the error messages like: send_packet6: Cannot assign requested address dhc6: sendpacket6() sent -1 of 84 bytes ** Tags added: verification-done-precise verification-done-trusty -- 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 Committed Status in isc-dhcp source package in Trusty: Fix Committed 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) 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 : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
