IPv6 security introduces new attack vectors: neighbor discovery spoofing (like ARP poisoning), rogue router advertisements, IPv6 tunneling bypassing IPv4 controls, and SLAAC abuse.
Many organizations have IPv6 enabled but unmonitored — attackers exploit this blind spot. RA Guard prevents rogue router advertisements. Disable IPv6 if not needed, or properly secure and monitor it. Dual-stack networks need dual security.