# File lib/net/dns/resolver.rb, line 345
      def nameservers=(arg)
        case arg
        when String
          begin
            @config[:nameservers] = [IPAddr.new(arg)]
            @logger.info "Nameservers list changed to value #{@config[:nameservers].inspect}"
          rescue ArgumentError # arg is in the name form, not IP
            nameservers_from_name(arg)
          end
        when IPAddr
          @config[:nameservers] = [arg]
          @logger.info "Nameservers list changed to value #{@config[:nameservers].inspect}"
        when Array
          @config[:nameservers] = []
          arg.each do |x|
            @config[:nameservers] << case x
                                     when String
                                       begin
                                         IPAddr.new(x)
                                       rescue ArgumentError
                                         nameservers_from_name(arg)
                                         return
                                       end
                                     when IPAddr
                                       x
                                     else
                                       raise ArgumentError, "Wrong argument format"
                                     end
          end
          @logger.info "Nameservers list changed to value #{@config[:nameservers].inspect}"
        else
          raise ArgumentError, "Wrong argument format, neither String, Array nor IPAddr"
        end
      end