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Feb
20
sensor analytics
Posted by Thang Le Toan on 20 February 2018 01:30 PM

Sensor analytics is the statistical analysis of data that is created by wired or wireless sensors.

A primary goal of sensor analytics is to detect anomalies. The insight that is gained by examining deviations from an established point of reference can have many uses, including predicting and proactively preventing equipment failure in a manufacturing plant, alerting a nurse in an electronic intensive care unit (eICU) when a patient’s blood pressure drops, or allowing a data center administrator to make data-driven decisions about heating, ventilating and air conditioning (HVAC).

Because sensors are often always on, it can be challenging to collect, store and interpret the tremendous amount of data they create. A sensor analytics system can help by integrating event-monitoring, storage and analytics software in a cohesive package that will provide a holistic view of sensor data. Such a system has three parts: the sensors that monitor events in real-time, a scalable data store and an analytics engine. Instead of analyzing all data as it is being created, many engines perform time-series or event-driven analytics, using algorithms to sample data and sophisticated data modeling techniques to predict outcomes. These approaches may change, however, as advancements in big data analytics, object storage and event stream processing technologies will make real-time analysis easier and less expensive to carry out.

Most sensor analytics systems analyze data at the source as well as in the cloud. Intermediate data analysis may also be carried out at a sensor hub that accepts inputs from multiple sensors, including accelerometers, gyroscopes, magnetometers and pressure sensors. The purpose of intermediate data analysis is to filter data locally and reduce the amount of data that needs to be transported to the cloud. This is often done for efficiency reasons, but it may also be carried out for security and compliance reasons.

The power of sensor analytics comes from not only quantifying data at a particular point in time, but by putting the data in context over time and examining how it correlates with other, related data. It is expected that as the Internet of Things (IoT) becomes a mainstream concern for many industries and wireless sensor networks become ubiquitous, the need for data scientists and other professionals who can work with the data that sensors create will grow -- as will the demand for data artists and software that helps analysts present data in a way that’s useful and easily understood.

 

Do you think conversational technologies like chatbots will soon be replaced by smarter AI agents?


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Feb
20
Recover your deleted files quickly and easily
Posted by Thang Le Toan on 20 February 2018 10:09 AM

Recuva®

Recover your deleted files quickly and easily.

Accidentally deleted an important file? Lost files after a computer crash? No problem - Recuva recovers files from your Windows computer, recycle bin, digital camera card, or MP3 player!

Download Free Version Get Recuva Pro!
  • Life saver

    Superior file recovery

    Recuva can recover pictures, music, documents, videos, emails or any other file type you’ve lost. And it can recover from any rewriteable media you have: memory cards, external hard drives, USB sticks and more!

  • Damaged disk

    Recovery from damaged disks

    Unlike most file recovery tools, Recuva can recover files from damaged or newly formatted drives. Greater flexibility means greater chance of recovery.

  • Scan

    Deep scan for buried files

    For those hard to find files, Recuva has an advanced deep scan mode that scours your drives to find any traces of files you have deleted.

  • Shredder

    Securely delete files

    Sometimes you want a file gone for good. Recuva’s secure overwrite feature uses industry- and military-standard deletion techniques to make sure your files stay erased.


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Feb
18
Intel Xeon D-2100 with VMware ESXi and Ubuntu 16.04 on Supermicro X11SDV
Posted by Thang Le Toan on 18 February 2018 05:14 PM
VMware ESXi 6.5u1 And Intel Xeon D 2100 With Supermicro X11SDV
VMware ESXi 6.5u1 And Intel Xeon D 2100 With Supermicro X11SDV

If you have been following our Intel Xeon D-2100 Series Launch Coverage Central you will have seen that we already published the expected Xeon D-2100 series OS compatibility list. Usually, VMware is one of the laggards in terms of hardware compatibility for bleeding-edge platforms. Conversely, Microsoft Windows and Linux tend to have leading compatibility of server parts. As a result, we wanted to take an opportunity to test the Intel Xeon D-2100 platform, based on a Supermicro X11SDV-4C-TLN2F, with VMware ESXi 6.5u1.

Intel Xeon D-2100 with VMware ESXi 6.5u1

We made a short, sub 2 minute, video of our results. In the video, you will see that indeed, this worked without an issue. We made the recording using an older ISO, from August 2017, just to ensure that there has not been an update since then. The VMware ESXi 6.5u1 was the first iteration to fully support Intel Xeon Scalable and AMD EPYC which is why it is becoming popular in data centers and labs.

At the start of the video, you can see the machine running Ubuntu 16.04.3 LTS prior to installation. In essence, while recording we realized that we covered Ubuntu compatibility inadvertently. Ubuntu was installed without a single additional driver needing to be added, and we have both GUI and server versions running on the Supermicro X11SDV generation platforms.

We wondered why we did not need to install an additional set of drivers, and the reason quickly became clear: Intel did something very smart with this generation. At the heart of the platform’s I/O is Lewisburg. If that sounds familiar, it is because the Lewisburg generation of PCH is what was introduced on the Intel Xeon Scalable series of mainstream server processors.

Intel Xeon D 2100 Series Lewisburg
Intel Xeon D 2100 Series Lewisburg

For those deploying these embedded platforms, it means that we expect broad out-of-box OS support for the Intel Xeon D-2100 series platforms out of the gate. That is not something we always see with new embedded platforms, such as the Intel Atom C3000 series.

Now, the question remains, if you are working with VMware ESXi virtualization solutions is the Intel Xeon D-2100 series the right platform. We think there is a place for it in highly space-constrained situations or those that require low power, low memory capacity, and high compute performance. You can check out our Platform Power Consumption and First Benchmarks of the Intel Xeon D-2100 Series and we will have lots more on STH in the near future.


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Feb
18
Supermicro AOC-SLG3-2E4R and Supermicro AOC-SLG3-2E4 Differences
Posted by Thang Le Toan on 18 February 2018 05:07 PM
Supermicro AOC-SLG3-2E4R with Intel 750 400GB
Supermicro AOC-SLG3-2E4R with Intel 750 400GB

One question we have seen multiple times in e-mail and in the forums is: what is the difference between the Supermicro AOC-SLG3-2E4R and Supermicro AOC-SLG3-2E4 NVMe expansion cards. Users are looking for ways to efficiently use available PCIe resources to add NVMe capabilities. The 2.5″ SFF NVMe drives have the potential to add more drives to a system than their add-in-card (AIC) PCIe x4 counterparts. As a result, many users are looking to add NVMe expansion capabilities to their existing systems yet there are few currently available options. Two options we found as part of earlier research were the Supermicro AOC-SLG3-2E4R and Supermicro AOC-SLG3-2E4. Information was sparse on these so we did a bit of digging and have the differences.

The Supermicro AOC-SLG3-2E4

The Supermicro AOC-SLG3-2E4 has a PLX PEX 8718 chip to handle adding two PCIe x4 SSDs into a single PCIe x8 or x16 slot. PLX (now part of Avago) makes PCIe switch chips that help aggregate PCIe lanes when a CPU’s PCIe controller would otherwise be maxed out. The PEX 8718 is a 16 lane 5 port PCIe 3.0 switch (specs here.) That makes sense with two x4 lane sets going to the drives and x8 going to the host. This is certainly the more complex of the two and costs $100 more at $249 on Amazon or ebay.

Supermicro AOC-SLG3-2E4 Specs - 800
Supermicro AOC-SLG3-2E4 Specs – 800

The Supermicro AOC-SLG3-2E4R

The Supermicro AOC-SLG3-2E4R – $149 (Amazon or Ebay but I got from ebay) is a lower cost part with no PLX chip onboard. It also therefore consumes less power but has a much tighter compatibility matrix.

Supermicro AOC-SLG3-2E4R Specs - 800
Supermicro AOC-SLG3-2E4R Specs – 800

Results with the AOC-SLG-2E4R

In a quest to add 2.5″ SFF PCIe/ NVMe capabilities to existing systems we started working on an experiment with the lower cost AOC-SLG3-2E4R and an Intel 750 400GB SSD which comes with the required cable. We were cable limited, not drive limited but were able to test the card with a variety of single drives.

 

Supermicro AOC-SLG3-2E4R with 13 SFF SSDs
Supermicro AOC-SLG3-2E4R with 13 SFF SSDs

The overall results were mixed. Initially we had success with several motherboards which apparently had onboard PLX controllers and with a Xeon D test system, even when using non-Intel 750 SSDs. For example, here was a Supermicro Xeon D platform with a Dell branded Samsung XS1715 800GB drive which worked (although according to the slide above it should not have.)

Desktop SFF NVMe SSD working Dell Supermicro
Desktop SFF NVMe SSD working Dell Supermicro

We did see a few issues on motherboards without PCIe switch chips.

Bottom line

Right now we are thinking the AOC-SLG3-2E4 may be the better option from a compatibility standpoint. We should have a card by the second week in June to verify. Keep checking this thread in the STH forums for more updates.

One potentially interesting implication is that a 32 lane PLX PCIe switch chip could be used to build a PCIe x16 to 4x NVMe card or the technology could potentially allow over subscription of drives to PCIe lanes, greatly enhancing the ability of server vendors to add more PCIe SSDs.


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Dec
10
Manage Office 365 Users Passwords using PowerShell
Posted by Thang Le Toan on 10 December 2017 11:25 PM

In the current article, we will review how to use PowerShell commands for managing user password in Office 365 environment.

Office 365 user’s password management versus the “standard” Domain Active Directory is a little restricted.

(https://o365info.com/manage-office-365-users-password-using/)

For example – configure password policy parameters such as – Enforce password history, Minimum password length, Password must meet complexity requirements cannot be configured by the Office 365 administrator.

At the current time, the options that related to Office 365 users password management are – reset the user password and setting the number of a maximum number of days or password expiration (the default is 90 days).

So, what are the options that are available for Office 365 user’s password management?
In this, the article will review a couple of options. Some of the options can manage by using the Office 365 Web interface and some task only by using PowerShell.

Step 1: Download and install required components

Before we can start the remote PowerShell session to Office 365, we need to download the required cmdlets. Additional pre-requirement is to: install the: Office 365 sign in assistant.

You can find the required software component using the following links:

1. Microsoft Online Services Sign-In Assistant
You can download the Microsoft Online Services Sign-In Assistant by using the following link:
Microsoft Online Services Sign-In Assistant for IT Professionals RTW

Choose the download option

Download the Microsoft Online Services Sign-In Assistant -01.jpg

Choose the right version for your OS (most of the modern OS are 64-bit version).

Download the Microsoft Online Services Sign-In Assistant -02.jpg

2. Office 365Powershell

You can download the indows Azure Active Directory Module for Windows PowerShell by using the following link:
Windows Azure Active Directory Module for Windows PowerShell

Click on the link named:  Azure Active Directory Module for Windows PowerShell (64-bit version)

 

Install the Azure AD Module.jpg
After the installation of PowerShell cmdlets, we will find a new icon on the desktop named: Microsoft Online Services Module for Windows PowerShell.
(An additional option is to use: start menu > All Programs > Microsoft online servicesMicrosoft online service module for Windows PowerShell

 

Microsoft Online Services Module for Windows PowerShell

 

The Microsoft Online Services Module for Windows PowerShell shortcut includes a command the will imports Office 365 cmdlets to the PowerShell console.

 

Technically we don’t have to use this shortcut. We can manually import the 365 cmdlets to the PowerShell console by using the command: Import-Module MSOnline

 

Import  Office  365  cmdlets to  the PowerShell console-03

Step 2: First time configurations

I must admit that the First-time configurations is a little a bit “Naggers” but, after creating the required settings, the next time will be easier. The PowerShell remote connection requires the following configuration settings:

1 – Run as Administrator

To be able to change the PowerShell Execution Policy, we need to run PowerShell console, by using the option: Run as administrator.

Run as administrator-01

Right click on the Microsoft Online Services Module for Windows PowerShell icon and chose the option: Run as administrator.
Run as administrator-02

2 – Setting the PowerShell Execution Policy

PowerShell security policy (“Execution policy”) can be defined by using one of the following options (modes): Restricted, AllSigned, RemoteSigned, and Unrestricted.
(The default mode is: Restricted).
To change the Execution policy open the Microsoft Online Services Module for Windows PowerShell and type the command:

Set-ExecutionPolicy Unrestricted

Set-ExecutionPolicy RemoteSigned-04

To execute PowerShell command, we use the “ENTER” key.

Step 3: Connect to Office 365 by using Remote PowerShell

Open the Microsoft Online Services Module for Windows PowerShell and Type (or copy and paste) the following command:

Connect-MsolService

A pop out windows will appear. Type your credentials by using the UPN (user Principal name) format. For example: admin@o365info.com

Connect-MsolService-05

Note – the user name should have global administrator rights in the Office 365 environment.

1. Set Password never expired

Set Password never expired for Office 365 user

PowerShell command Syntax

PowerShell command Example

Disable Password never expired option for a Office 365 user

PowerShell command Syntax

PowerShell command Example

Set Password never expired for ALL Office 365 users (Bulk Mode)

PowerShell command Syntax

Re-enable Password expired ( the default) for ALL Office 365 users (Bulk Mode)

PowerShell command Syntax

2. Set Password

Set a Predefined Password for Office 365 user

PowerShell command Syntax

PowerShell command Example

Set a Predefined Password for all Office 365 users (Bulk mode)

PowerShell command Syntax

PowerShell command Example

Set a Predefined Password for Office 365 users imported from a CSV File

Step 1: Export Office 365 users account
PowerShell command Syntax

Step 2: Set a Predefined Password

Example: Step 1: Export Office 365 users account

Predefined Password-CSV

PowerShell command Example

Create new Office 365 user and set a unique temporary password by import the information from CSV file

temp password

You can download a sample CSV file – Password.csv

PowerShell command Example

Provisioning Office 365 user and export information from Active Directory

In case that you need to export Active Directory on-Premise user account based on a specific parameter, you can use the PowerShell cmdlets named – get-aduser (you will need to use PowerShell console from DC or import the Active Directory cmdlets to the existing PowerShell console
For example:

Example 1 – display or export, all of the Active Directory users that located in a specific OU.

 

In our particular scenario, the domain name is – o365info.com and the specific OU is – Test

Display information about – all of the Active Directory users that located in a specific OU

PowerShell command Example

Export to a CSV file information about – all of the Active Directory users that are located in a specific OU + choose a specific data fields.

Example 2 – display + export information about Active Directory users from a specific department.

The PowerShell command syntax is:

An example to a scenario in which we want to export information only about Active Directory users that belong to the marketing department could be

Set a Temporary Password for a specific user

PowerShell command Syntax

PowerShell command Example

Set a Temporary Password for all Office 365 users (Bulk Mode)

PowerShell command Syntax

PowerShell command Example

3. Office 365 Password Policy

Set Office 365 Password Policy

PowerShell command Syntax

PowerShell command Example

4. Display Password settings

Display Password settings for all Office 365 users

PowerShell command Syntax

Display information about Office 365 Password Policy

PowerShell command Syntax

PowerShell command Example

5. Download Manage password PowerShell menu script

Manage Office 365 Users Passwords using PowerShell | Office 365

You can read more detailed information about the PowerShell commands that are used in the script in the article: Manage Office 365 Users Passwords using PowerShell | Office 365
Manage Office 365 Users Passwords using PowerShell


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Sep
24
Uninstall Office from a PC
Posted by Thang Le Toan on 24 September 2017 12:29 AM

The following steps describe how to uninstall Office products on a PC (laptop, desktop, or 2-in-1). To uninstall Office 2011 or 2016 for Mac, see Uninstall Office 2016 for Mac or Uninstall Office 2011 for Mac.

Try uninstalling Office using the Control Panel first. If that doesn't work use the easy fix tool or try uninstalling Office manually.

Important: You can't uninstall an individual app such as Word or Publisher that's included as part of your Office Suite installation. The only way to uninstall an individual app is if you purchased it as a stand-alone version.

If you have an Office 365 subscription, you probably have the latest version of Office installed. However, if you're not sure if you have Office 2016 or Office 2013 installed as part of your subscription, see What version of Office am I using?

Option 1 - Uninstall Office 2016 using the Control Panel

Choose your operating system below to see the steps for uninstalling Office from the Control Panel.

 
  1. Right-click the Start button Windows Start button in Windows 8 and Windows 10 (lower-left corner), and choose Control Panel.

    Options and commands list see after pressing Windows logo key + X
  2. Select Programs and Features, then right-click your Microsoft Office product, and choose Uninstall.

    Note: If you installed an Office suite such as Office Home and Student or you have an Office subscription, search for the suite name. If you bought an individual Office application, such as Word or Visio, search for the application name.

  3. Follow the instructions on the screen.

To reinstall Office, follow the steps in Download and install or reinstall Office on your PC or Mac.

Option 2 - Completely uninstall Office 2016 with the easy fix tool

  1. Click this easy fix button to uninstall Office.

    Easy fix download button indicating an automated fix is available
  2. For the remaining steps showing how to save and use the easy fix, select your browser from the drop-down list below

     
    1. Select Save File, and then OK.

      Save O15CTRRemove.diagcab file in Firefox

      In the upper-right browser window, select Show all downloads. In the Library, select Downloads > O15CTRRemove.diagcab, and then select the folder icon. Double-click the O15CTRRemove.diagcab.

    2. The Uninstall Microsoft Office wizard launches. Select Next and follow the prompts.

    3. When you see the Uninstallation successful screen, follow the prompt to restart your computer for the changes to take effect. Select Next.

    4. After restarting your computer, you can try installing Office again.

Reinstall Office

To reinstall Office, follow the steps in Download and install or reinstall Office on your PC or Mac.

Note: This easy fix won't work if you installed Office from the Windows Store. To uninstall Office in the Windows Store, go to Start > Settings > Apps & Features. Scroll through the list until you find Microsoft Office Desktop Apps. Select Uninstall.

Option 3 - Uninstall Office 2016 manually

If the easy fix tool doesn't completely uninstall Office from your PC, you can manually uninstall Office. See:

Reinstall Office

To reinstall Office, follow the steps in Download and install or reinstall Office on your PC or Mac.

 

===================>

If you need to for any reason, you can uninstall Office using the Programs and Features applet in the Windows Control Panel like you normally do – or you can use a quick engineering fix from Microsoft to accomplish the task.

Download it: o15ctrremove.cab

The .cab file can be used to manage the removal of Office from a central location on a single PC or multiple PCs at once, particularly if you use an on-premises tool like System Center Configuration Manager.


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Sep
23

Để tăng được kích thước ổ cứng ảo trong máy chủ Gravity Zone Appliance GVA chạy hệ điều hành Linux Ubuntu

Chúng ta sẽ có thể lựa chọn 2 phương án:

Phương án 1: tăng kích thước ổ cũ theo Group “gzvg”

  1. Mở cửa sổ console của GVA hoặc kết nối bằng SSH PuTTy qua cổng 22, gõ lệnh đăng nhập user: bdadmin.
  2. Gõ lệnh sudo -s để đổi sang quyền root
  3. Giả sử chúng ta muốn mở rộng ổ cứng ngầm định của GVA từ 125 GB lên 140 (thường ngâm định GVA có 80GB)
  4. Tạo bảng phân hoạch mới gõ lệnh: fdisk /dev/sda
  5. Gõ phím n
    à Tạo bảng phân hoạch mới.
  6. Gõ phím p
    à in ra bảng phân hoạch ổ cứng.
  7. Gõ phím w
    à Viết 1 bảng phân hoạch ổ cứng mới.
  8. Gõ lệnh: Reboot khởi động lại GVA mới cập nhật các bước trên.
  9. fdisk -l (xem tất cả các phân hoạch ổ cứng)
  10. gõ lệnh: pvcreate /dev/sdaX (X là số thứ tự có thể kiểm tra số đó trước bằng lệnh: fdisk -l) -> kết thúc lệnh trên sẽ tạo physical volume
  11. vgextend gzvg /dev/sdaX -> là lệnh để mở rộng kích thước ổ cho volume group có tên “gzvg” (dùng lệnh: vgdisplay -shows để xem chi tiết group gzvg)
  12. lvextend -rl +100%FR­EE /dev/gzvg/root -> đã thực hiện lệnh mở rộng logical volume (dùng lệnh: lvdisplay -shows để xem hết các ổ logic volumes) 


Phương án 2: tạo thêm 1 ổ cứng mới:

  1. Mở cửa sổ console của GVA hoặc kết nối bằng SSH PuTTy qua cổng 22, gõ lệnh đăng nhập user: bdadmin.
  2. Gõ lệnh sudo -s để đổi sang quyền root
  3. Giả sử chúng ta muốn tạo thêm ổ cứng mới 5GB, ngoài 1 ổ cứng của GVA 125 GB (thường ngâm định GVA có 80GB)
  4. Tạo phân hoạch mới bằng lệnh: fdisk /dev/sdb
  5. Ấn phím n để tạo phân hoạch mới.
  6. Ấn phím p để in bảng cấu trúc phân hoạch.
  7. Ấn phím w để viết bảng phân hoạch mới.
  8. Gõ lệnh: fdisk -l (để xem tất cả các phân hoạch)
  9. Gõ lệnh: pvcreate /dev/sdbX (X là số thứ tự của ổ cứng mới tạo, có thể kiểm tra số đó trước bằng lệnh fdisk -l) -> đã thực hiện tạo ổ physical volume.
  10. Gõ lệnh: vgextend
    gzgv /dev/sdbX -> là lệnh mở rộng kích thước ổ cho volume group có tên “gzvg” (dùng lệnh: vgdisplay -shows để xem chi tiết group gzvg)
  11. Gõ lệnh: lvextend -rl +100%FR­EE /dev/gzvg/root -> đã thực hiện lệnh mở rộng ổ logical volume (dùng lệnh: lvdisplay -shows để xem hết các ổ logic volumes)

Read more »



Sep
9
Các DNS nhanh và tốt nhất, Google, Viettel, FPT, VNPT, Singapo, DNS Server
Posted by Thang Le Toan on 09 September 2017 01:06 PM

Với danh sách DNS nhanh nhất tổng hợp dưới đây sẽ giúp bạn lựa chọn được 1 DNS trong nước hoặc DNS nước ngoài hiệu quả để tăng tốc độ duyệt web, chơi game cũng như truy cập vào những web bị chặn như Facebook, Blog. Cùng xem danh sách DNS nhanh nhất gồm những dải DNS nào nhé.

DNS hiểu một cách đơn giản là công cụ để phân giải tên miền, là công cụ trung gian kết nối người dùng và các dịch vụ Internet thông qua việc nhập các tên miền xác định trên thanh địa chỉ của các trình duyệt web. Có nhiều loại DNS và các DNS nhanh gần như đóng vai trò quyết định tốc độ duyệt web nhanh hơn.

Các DNS nhanh và tốt nhất được chia sẻ trong bài viết này đều đã được kiểm định và đảm bảo có tốc độ ổn định, bảo mật tốt.Tuy nhiên trong nhiều trường hợp DNS có thể chậm hoặc chập chờn do có quá nhiều lượt truy cập.
Các DNS nhanh và tốt nhất, Google, Viettel, FPT, VNPT, Singapore, DNS Server

Danh sách DNS tốt nhất tại Việt Nam

Tại Việt Nam, một số DNS nhanh của các nhà mạng Việt Nam sẽ có tốc độ ổn định hơn so với nước ngoài, ví dụ như DNS Viettel, VNPT hoặc FPT.

 

DNS VNPT:

 

203.162.4.191

 

203.162.4.190

 

DNS Viettel:

 

203.113.131.1

 

203.113.131.2

 

DNS FPT:

 

210.245.24.20

 

210.245.24.22

DNS NetNam

203.162.7.89

203.162.6.71

203.162.0.181

203.162.0.24

203.162.22.2

203.162.7.131

203.162.21.114

203.162.7.89

203.162.7.71

DNS VNNIC

203.162.57.105

203.162.57.107

203.162.57.108

* Danh sách DNS tốt nhất của nước ngoài

Trong số các DNS tốt nhất của nước ngoài hiện nay, DNS Google hiện là DNS phổ biến và được sử dụng nhiều nhất.

DNS Google

8.8.8.8

8.8.4.4

DNS Singapore

165.21.83.88

165.21.100.88.

DNS OpenDNS

208.67.222.222

208.67.220.220

DNS Norton

198.153.192.1

198.153.194.15

DNS Comodo Secure

8.26.56.26

8.20.247.20

FreeDNS.zone

37.235.1.174

37.235.1.177

DNS Norton (dành cho gia đình)

Bảo mật (chống mã độc, website lừa đảo)

199.85.126.10

199.85.127.10

Bảo mật + chống nội dung khiêu dâm

199.85.126.20

199.85.127.20

Bảo mật + chống nội dung khiêu dâm + chặn nội dung độc hại cho gia đình

199.85.126.30

199.85.127.30

DNS Advantage

156.154.70.1

156.154.71.1

DNS Dnsadvantage

156.154.70.1

156.154.71.1

DNS Hi-Teck

209.126.152.184

216.98.138.163

209.126.152.185

DNS SmartViper

208.76.50.50

208.76.51.51

DNS Verizon

4.2.2.1

4.2.2.2

4.2.2.3

4.2.2.4

4.2.2.5

4.2.2.6

DNS.WATCH

84.200.69.80

84.200.70.40

http://thuthuat.taimienphi.vn/cac-dns-nhanh-va-tot-nhat-google-viettel-fpt-vnpt-singapo-dns-server-22738n.aspx
Trên đây là tổng hợp danh sách những DNS nhanh nhất và tốt nhất cả về khả năng bảo mật. Người dùng sau khi đổi DNS có thể trải nghiệm tốc độ mạng thay đổi đáng kể so với trước. Ngoài ra, việc chọn các DNS tốt nhất và tiến hành đổi DNS cũng giúp sửa lỗi DNS Server not responding khá phổ biến hiện nay.

Tình trạng lỗi DNS Server Server not responding xảy ra chủ yếu do địa chỉ DNS mà người dùng lựa chọn không phản hồi dẫn tới không thể điều hướng tới trang web đích. Có nhiều trường hợp khác còn do tốc độ mạng chậm, để giải quyết lỗi này --> nâng cấp gói cướng và tốc độ do ISP cấp.

 


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Mar
20
General information about TXT & SPF Records
Posted by Thang Le Toan on 20 March 2016 12:51 PM

TXT RECORD :

A TXT record allows an administrator to insert arbitrary text into a DNS record. For example, this record is used to implement the Sender Policy Framework and DomainKeys specifications.
TXT record belongs in the zone data file for subdomain, not in the parent zone.

Example :


dnsmadeeasy.com. TXT IN 1800 “v=spf1 a mx ip4:66.117.40.198/32 ip4:205.234.170.0/24 ip4:64.246.42.123/32 ip4:64.246.42.203/32 ip4:63.219.151.0/24 include:tiggee.com ~all”

 

SPF POLICY :

Here is an example to give you an idea of how SPF works :

example.net. TXT “v=spf1 mx a:pluto.example.net include:gmail.com -all”

The parts of the SPF record mean the following:

  • v=spf1 - SPF version 1
  • 'mx' - the incoming mail servers (MXes) of the domain are authorized to also send mail for example.net
  • a:pluto.example.net - the machine pluto.example.net is authorized, too
  • include:gmail.com - everything considered legitimate by gmail.com is legitimate for example.net, too
  • all - all other machines are not authorized

Domains identify the machines authorized to send e-mail on their behalf. They do this by adding an additional record to their existing DNS information.

Receivers can request and use SPF information. They use ordinary DNS queries, which are typically cached to enhance performance. Receivers then interpret the SPF information as specified and act upon the result.


Please Note : The key issue in SPF is the specification for the new DNS information that domains set and receivers use. The records are laid out like this (in typical DNS-syntax):

example.org. IN TXT “v=spf1 a mx -all”

“v=” defines the version of SPF used, the following words provide mechanisms to use to determine if a domain is eligible to send mail. The “a” and “mx” specify the systems permitted to send messages for the given domain. The “-all” at the end specifies that, if the previous mechanisms did not match, the message should be rejected.


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Oct
1
IVORY TOWER Documentary on Exploding Tuition Costs w. Andrew Rossi
Posted by Thang Le Toan on 01 October 2015 12:40 PM

Published on Jan 30, 2014


IVORY TOWER is the documentary about college costs and exploding tuition rates in the United States, and we look at the trailer and footage direct from the movie's premiere at the 2014 Sundance Film Festival. Filmmaker Andrew Rossi discusses how the United States has gone from a nation that emphasized accessible higher education, to a country where the big business of education has made economic and social mobility less fluid than ever. We also discuss the potential for alternative models of affordable education and the sacrifices that people are having to make to go to college in this BYOD--the world's only talk show all about documentary films.

FILM INFO:
IVORY TOWER questions the purpose of higher education in an era when the price of college has increased more than for any other service in the U.S. economy since 1978. While many college graduates struggle to find menial employment waiting tables and cleaning toilets, new student loans over the next 10 years will total $184 billion. Filmmaker Andrew Rossi reveals the moment in history when the United States, long regarded as the epicenter of higher education, embraced a business model promoting property expansion over quality learning. Through interviews with Andrew Delbanco, Anya Kamenetz, and Internet education pioneer Daphne Koller, cofounder of the revolutionary online platform Coursera, Ivory Tower exposes the instability of traditional college education as it searches the country for alternative forms of cost-effective learning, ranging from concepts of self-governance taught at Deep Springs College in Big Pine, California, to the unofficial hacker houses of northern California.

Filmmaker Bio: Andrew Rossi returns to the Sundance Film Festival following his last film, Page One: Inside the New York Times, about the crisis in the newspaper industry. Distributed by Participant Media and Magnolia Pictures,Page One was nominated for two news and documentary Emmy Awards as well as receiving various critics' awards. Rossi is also the director of Le Cirque: A Table in Heaven, which screened on HBO, and was an associate producer on Jehane Noujaim's Control Room.

ADD'L LINKS:
https://twitter.com/a_rossi
https://twitter.com/IvoryTowerFilm
BYOD Full Episodes Playlist:
https://www.youtube.com/watch?v=RC7W4...
BYOD Short Clips Playlist:
https://www.youtube.com/watch?v=cN-hJ...
http://www.youtube.com/theliptv
https://www.facebook.com/BYODOC?direc...
https://www.facebook.com/thelip.tv?re...

EPISODE BREAKDOWN:
00:01 IVORY TOWER
00:33 Welcoming Andrew Rossi to BYOD from Sundance 2014.
05:55 IVORY TOWER, Trailer.
19:48 IVORY TOWER, clip.


Show
Bring Your Own Doc

Season
7

Episode
124c

Release date
1/29/14

Running time
20:20

Actor
Ondi Timoner

Director
Kevin Hamedani

Producers
Ondi Timoner,
David Minick,
Michael Lustig

Writer
Ondi Timoner

Category
Documentary,
Entertainment,
News

License
Standard YouTube License


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