SI6 Networks’ IPv6 toolkit is a security assessment and troubleshooting tool for the IPv6 protocols. It can send arbitrary IPv6-based packets.
You can download it from the following link: https://packetstormsecurity.com/files/download/124831/ipv6toolkit-v1.5.2.tar.gz
Source: https://packetstormsecurity.com/files/124831/IPv6-Toolkit-1.5.2.html