Forwarding NDP Proxy

Hi,

up until now I had used OpenWRT. But I decided to have a RB2011iL-IN.

Because of the restrictions of my ISP I had to rely on forwarding the NDP Proxy to my LAN for IPv6.
Thus, IPv4 is NATed and IPv6 is transparently firewalled.

The basic idea of this setup came from http://wiki.openwrt.org/doc/howto/ipv6#directly.forward.isp.s.ndp.proxy.address.to.lan

What I wanted not know how I can replicate this? Is there ebtables? How to set it up by the web interface?

Thx in advance

Bye

Does anybody has an idea how to do it? I really need some help, because there is no other way to do it.