I think the problem is not related to NetworkManager but dhclient itself. Trying to use DHCPv6 in a Debian 8 machine (no GUI/NM) (using "iface eth0 inet6 dhcp" in /etc/network/interfaces) the "dhclient -6" instance is not started either). Only after I run dhclient manually once (as observed by the OP) it starts working. I use:
# dhclient -6 -d eth0 Doing this the DUID (type 1) is generated and the configuration manager works as expected (networkmanager in Ubuntu or ifup/ifdown in Debian). -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to network-manager in Ubuntu. https://bugs.launchpad.net/bugs/1484932 Title: ipv6 dhcp client never started. Status in network-manager package in Ubuntu: Confirmed Bug description: I'm in a ipv6 network that sets ip number with dhcpv6 and not using the stateless protocol. but using ubuntu 15.04 there is never any dhclient started for ipv6 and no way to change any configuration that I can find to start it. if I attach the cable and then manually start dhclient with "dhclient -6 -i eth3_109" I do get a ipv6 address and things works as intended. There has to be some way to star the dhclient software from network manager but I can't find it. There should be two dhclients started per network device one for ipv4 and one for ipv6 only one is started for me. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: network-manager 0.9.10.0-4ubuntu15.1 Uname: Linux 4.1.5-040105-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.17.2-0ubuntu1.2 Architecture: amd64 CurrentDesktop: Unity Date: Fri Aug 14 14:32:06 2015 IfupdownConfig: # interfaces(5) file used by ifup(8) and ifdown(8) auto lo iface lo inet loopback InstallationDate: Installed on 2015-04-09 (126 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Beta amd64 (20150326) IpRoute: default via 10.10.1.254 dev eth3 proto static metric 1024 10.10.1.0/24 dev eth3 proto kernel scope link src 10.10.1.156 10.10.6.0/24 dev eth3_109 proto kernel scope link src 10.10.6.14 169.254.0.0/16 dev eth3 scope link metric 1000 NetworkManager.state: [main] NetworkingEnabled=true WirelessEnabled=false WWANEnabled=true WimaxEnabled=true SourcePackage: network-manager UpgradeStatus: No upgrade log present (probably fresh install) nmcli-nm: Error: command ['nmcli', '-f', 'all', 'nm'] failed with exit code 2: Error: Object 'nm' is unknown, try 'nmcli help'. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1484932/+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
