THC-IPV6 is a toolkit that attacks the inherent protocol weaknesses of IPv6 and ICMP6 and it includes an easy to use packet factory library.
You can download it from the following link: https://packetstormsecurity.com/files/download/117302/thc-ipv6-2.0.tar.gz
Source: https://packetstormsecurity.com/files/117302/THC-IPV6-Attack-Tool-2.0.html