My provider does not offer IPv6 connectivity. To see the dancing kame, I activated the IPv6 option in my Fritz!Box 7390 – having IPv4 and IPv6 in my network as a result. Unfortunately, the box sometimes favours IPv6 over IPv4 in local name resolution, and as a result, my local traffic seems to be routed through the tunnel provider – which makes NFS, for instance, extremely slow. For now, I’m turning it off, since there seems to be no option to change this behaviour on the Fritz!Box.
Ubuntu + Fritz!Box + ipv6 = Ouch
