NDP: Proxy: Restricted

The NDP proxy functionality works like a node or router in the middle of multiple segments with the same prefix. The NDP proxy sends Neighbor Advertisement (NA) replies to Neighbor Solicitation (NS) requests on behalf of nodes in a different physical segment that are not directly reachable by the nodes in the originating segment. In interface restricted mode, NDP proxy enables packet forwarding among the hosts that are in the same subnet and restricted to communicate directly with each other.