One thing bothering me is the lack of gateway being set. For my IPv4 WAN connection a gateway (obtained through DHCP) is present but not for my 6in4 tunnel. I know what the gateway parameter should be but it seems I have no way of setting it.
With zero information, I'm not sure anyone knows exactly what bothers you and can offer any thoughts. If it works for you, the gateway is there and probably in a format that you don't want to see?