Can't get ipv6 address assigned correctly.

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https://bbs.archlinux.org – I use NetworkManager and dhclient for auto-configuration but it has some weird problems.When I boot up my laptop, I only have chance to get access to ipv6 network, when I fail, I tried to delete the connection in Network Management Settings, and then added a new profile, disable and then enable the network again. Sometimes it works well, but sometimes it failed to auto-config.If I use the command:$ ip -6 routthen I'll get the following message:unreachable fe80::/64 dev lo proto kernel metric 256 error -101 fe80::/64 dev wlan0 proto kernel metric 256 default via fe80::2e0:2ff:fe54:59 (HowTos)