NDP and DAD proxy support on multiple interfaces

We support Neighbor Discovery Protocol (NDP) and duplicate address detection (DAD) proxy functionality on multiple interfaces (interface unrestricted mode). To enable NDP and DAD proxy (interface unrestricted mode), use the set interfaces <interface> unit <number> family inet6 ndp-proxy interface-unrestricted and set interfaces <interface> unit <number> family inet6 dad-proxy interface-unrestricted commands respectively. To view the NDP and DAD proxy (interface unrestricted mode)statistics and to monitor proxy requests and responses use the show system statistics icmp6 command.