EthernetShield enc28J60 IPv6 Not Working

I have been at it for hours now trying to get the ipv6 webserver functioning from:

It hasn't been updated in a while, but it appears it should work with my Arduino UNO, Arduino IDE 1.0.1, and EthernetShield 28J60. I can ping the webserver, but that's about it. Going through the code, it's difficult to figure out where it is failing.

I have some debugging checking when it receives a packet and spitting it out over the serial connection, which seems to work fine. But it never sends any response back. Anyone have experience with this? Any help would be greatly appreciated.

Running WireShark, I can see the request via HTTP to it. I can only see responses from ping and neighbor discovery, nothing else. Weird

NOTE: Using the IPv4 webserver works fine. I am knowledgable about IPv6 to the extent my home network is functioning fine with it.

Thanks ahead of time!