Comment 15 for bug 1120617

workarounds:

sudo sysctl net.ipv6.conf.wlan0.accept_dad=0
followed by disconnecting and reconnecting wireless gets IPv6 back for me for the session, and
adding 'net.ipv6.conf.wlan0.accept_dad=0' to '/etc/sysctl.conf' got IPv6 to work on reboots.

without that command:

IPv6 works on my Orange PI (wired/wireless, with the same router).
IPv6 worked on my ethernet port(well it did before it broke - don't force in/out uncrimped cable ends)

IPv6 seamed to work on this system with another router when doing wireless. (brief impromptu test, forgot if I already issued the sysctl command)

(Debian 8)