This does *not* appear to resolve a closely related problem where the
link-local address has not yet been assigned. See LP: 1718568
In brief, the loop
case " $out " in
*\ dadfailed\ *)
error "$dev: ipv6 dad failed."
return 1;;
*\ tentative\ *) :;;
*) return 0;;
esac
exits with 'return 0' with the lack of a link-local address as " "
($out empty) matches the default pattern as would a valid, link-local
address.
One possible solution is to add "the missing case" that matches $out
being empty that performs the "wait and try again" action.
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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)
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