I set up a full dual-stack enterprise network in GNS3, launched a silent IPv6 man-in-the-middle attack using nothing but a Python script — and then shut it down completely with a single switch policy. This post walks through every step: the topology, the ACLs, the attack, and the mitigation. Table of Contents What This Project Is About The Threat: SLAAC Abuse Lab Setup Network Topology and Addressing Dual-Stack Configuration Parallel ACL Policy — IPv4 and IPv6 ...