"The document describes a proxy-based mechanism allowing the use of Duplicate Address Detection (DAD) by IPv6 nodes in a point-tomultipoint architecture with a ""split-horizon"" forwarding scheme@ primarily deployed for Digital Subscriber Line (DSL) and Fiber access architectures. Based on the DAD signaling@ the first-hop router stores in a Binding Table all known IPv6 addresses used on a pointto- multipoint domain (e.g.@ VLAN). When a node performs DAD for an address already used by another node@ the first-hop router defends the address rather than the device using the address."