Cybercriminals have started launching distributed denial-of-service (DDoS) attacks against networks that transmit data over IPv6. 2011 was the first year when IPv6 DDoS attacks were recorded. Majority of organizations remain reluctant to switch to the new IP protocol version because their existing network security and traffic analysis equipment is not fully compatible with it. Some companies have projected increases of more than 100 percent for their IPv6 traffic volumes over the next 12 months, but the changes will be insignificant compared to the overall traffic volume.”]
Source: https://www.csoonline.com/article/2131001/ddos-attackers-start-targeting-ipv6-networks.html