Implant a route into victim-ip, which redirects all traffic to target-ip to new-ip. You must know the router which would handle the route. If the new-router-mac does not exist, this results in a DOS. If the TTL of the target is not 64, then specify this is the last option.
The homepage for this toolkit is: https://github.com/vanhauser-thc/thc-ipv6