def METHOD_NAME(factory, zep_dispatch):
    with rpl_nodes(factory, zep_dispatch) as (root_addr, D):
        # ping root node from last node
        parser = PARSERS["ping6"]
        # test reachability
        result = parser.parse(D.ping6(root_addr))
        # assert packetloss is under 34% (1 packet may get lost)
        # assert at least one response
        # 2 intermediate hops, 64 - 2
        assert_result(result, 34, 1, 64 - 2)
        result = parser.parse(D.ping6(root_addr, count=100, interval=30, packet_size=500))
        # assert packetloss is under 90%
        # assert at least one response
        # 2 intermediate hops, 64 - 2
        assert_result(result, 90, 1, 64 - 2)