Windows 10 Update

Windows 10 Update

Microsoft has realized there’s a difficulty using Windows 10 on lower-end devices that boat with restricted storage. That difficulty, as soon as you get started downloading upgrades there is insufficient space available to install them using an external drive.

windows 10 update

He’s referring to this Spring Creators Update launch in May, also known as Redstone 4, that will observe the Microsoft developers concealed a key mystery in Windows wallpapers since they knew pictures would escape Windows 10 April Update is most likely the new name for Spring Creators Update Google’s Project Zero shows security flaw in Windows 10 S following Microsoft fails to

Previously, Microsoft has just provided a route from Windows 10 S to Windows 10 Pro, without any additional choices.

The slides appear to imply that both a change and an update would basically be a one-way road; there are no going back with no retrieval While Microsoft has not yet announced the public launch date of Windows 10 Redstone 4, the provider is anticipated to start the rollout and send the last pieces to the initial wave of programs this week.

windows 10 updates download
windows 10 update assistant 1903

Microsoft has touched most of landmarks before the official that the milder Windows 10 may be designed to make sure laptops and tablets with small internal storage can set up Windows 10 attribute updates. Moreover, the Redstone 5 trailer also has phone.

There’s been a great deal of drama surrounding Microsoft’s second significant feature upgrade for Windows 10. It was initially rumored to be known as the Spring Creators Update, after last season’s Creators Update (Spring) along with the Fall Creators Update (Fall).

More recently In ancient 2018 I got an email in the TechRepublic member requesting me to update and upgrade an article I wrote back in 2012 may take to include simple access to Google Docs into Microsoft Windows 10.

The easiest and most effective method is to add hyperlinks Initially scheduled to arrive on April 10, it currently seems upcoming Windows 10 Redstone 4 will not be published until May 8.

Though the Redmond software maker released a new trailer construct — considered to be RTM — past week and it’s been promoted to the Microsoft has released yet another cumulative upgrade for Windows 10, and now just programs running the Fall Creators Update (variant 1709) are receiving it.

KB4093105 lumps the OS model number to 16299.402 and includes a massive changelog.

Another Picture of windows 10 update:

update assistant 1809
update assistant 1903
update 1903
may 2019 update
Reconnecting.Error Code HCNetSDK.dll[91] – Hikvision Camera Video Loss Problem Solved!

Reconnecting.Error Code HCNetSDK.dll[91] – Hikvision Camera Video Loss Problem Solved!

Reconnecting.Error Code HCNetSDK.dll[91] – We have 8 Channel NVR DS-7608NI-SE with 7 cameras HikVision DS-2CD2020F-I and 1 Hikvision DS-2CD2120F-1 outdoor camera. One of DS-2CD2020F-I camera is not displaying the video most of the time. However, if we connect directly to the camera’s IP, not via NVR it shows the video perfectly, however using this mode I cannot record the video to the hard drive that located inside the NVR.

error code hcnetsdk.dll [91]

Troubleshooting Reconnecting.Error Code HCNetSDK.dll[91] error:

  • We exchange POE adaptor with a good camera still same result
  • We change port on the switch still same result
  • We tried to view using IE, Firefox, and Google Chrome, the problem is a consistent camera in backyard area is not working most of the time

Our conclusion at this stage is the problem is not software related. There are two possibilities, Camera problem or NVR problem.

  • We contact our CCTV supplier and they bring the new camera after replacing with the new camera we still have the problem.

The problem camera was not displaying video has been resolved:
After several tests, we found that the problem was not enough power to the camera sent by the adaptor.

Passive POE injector and splitter

All cameras we bought using passive POE adaptor as below picture. With passive POE adaptor, the max distance is about 40 meters (130 feet).
This kind of POE adaptor is not 802.3af standard, this is actually for a device that not POE capable. As a passive device, the longer the UTP cable the more drop power to the camera.

The installation of passive POE injector is not as simple as POE standard, near camera requires passive POE splitter to divide between the power cable and data cable. From POE passive splitter to other POE passive splitter using UTP cat 5.
Remember maximum cable length is 40 meters or 130 feet. More than 40mtrs you are going to have video loss problem as our experience above.

Active PoE Injector TL-POE150S

Finally, we are using POE Injector TL-POE150S, this device comply with IEEE 802.3af protocol. This POE injector will automatically adjust the power required by the camera (or other POE enable device). Support Gigabit speed and no other configuration required, just plug and play device.

How we install the TP-link POE and Hikvision camera:
We are using UTP cat 5 from camera DS-2CD2020F-I to the POE TL-POE150s the distance is about 80 meters. We placed the POE inside the switch cabinet where the electrical outlet available. We never experience video loss again since then.

My Conclusion:

  • Video loss problem on IP camera can be caused by power shortage to the camera. If your camera is POE capable device we suggest you use active POE (standard POE) for better power supply and can be used up to 100 meters.
  • If your device is not POE enable and less than 40 meters, you can use passive POE to power up the device properly.
  • If your device is not POE enable and use UTP cable up to 100 meters you still can use active POE with an additional device. TP-link have a product called TL-POE10R, combined with TL-POE150S it can be the answer to your need.
    POE output voltage are can be select from 5V, 9V, or 12V
System Info Command (systeminfo.exe) Remotely or Locally

System Info Command (systeminfo.exe) Remotely or Locally

System info or systeminfo.exe is a small utility that come with windows since windows XP up to the latest windows version (windows 10). This utility will retrieve information that very useful for administrator so he can decide the next step following the result.

Run System Info locally and remotely

System info can be executed to view local computer information or remote computer. To view system information type systeminfo.exe or systeminfo on the command prompt.

Run system info on remote computer
You can see what parameter you can use when running System info by typing systeminfo /? On the command prompt. Below is what we use so far.

systeminfo /s ABCL012008 /u ABCL012008administrator /p Ny357159 >> \ranfp3patchesBatchFilesComABCL012008.txt

The command above means, run systeminfo on remote computer ABCL012008 and use local administrator account to run the program. The password for local administrator is Ny357159. Send the result to file ABCL012008.txt

What is information we got after run systeminfo?

The information produced after run systeminfo is PC model and manufacturer, BIOS version, boot device, physical memory capacity (RAM). This information is helpful when we do inventory for hardware or software. At glance the result is almost the same with msinfo32.exe

Read about Scnotification

There is something interesting with the result, and this is what I like:

1. Original install date is the date where last time you rebuild the computer’s OS. By knowing this information, we can decide whether we will fix the problem of will rebuild the OS when problems come.

2. System boot time is the time when computer on. Normally system boot time is today, this means that the computer properly shutdown yesterday and turn on today. This is important to make sure that all updated program will be executed when boot. If the date is not today, then that computer is never turn of since the displayed date.

3. Logon server. If you have more than one domain controller in the network, you can know particular user is authenticated by which domain controller.

system info command

If we know this information we can know exactly which server is overloaded thus we can make arrangement to make balance load on each server.

More detail systeminfo command from Microsoft can be found here.

The other information is still important but we can also get from other program like MSINFO32.exe but the 3 info above I only see in system info command result.

Turn Photo into Sketch in seconds with Prisma Picture Art App

Turn Photo into Sketch in seconds with Prisma Picture Art App

Are you looking the way to turn your photo into a sketch with your Android devices or iPhone? Or you want Van Gogh style for your pictures. Now you find the perfect picture art app called Prisma. See below examples from original photo into a sketch in seconds.

Turn Photo into Sketch in seconds with Prisma samples

We can use existing photos or take a picture with your phone camera, all can be turned into a piece of artwork by using Prisma app that uses Artificial Intelligence to produce excellent artwork that usually produced by professional artists.

If you want to make your house or cat look like animation or sketches, this app will do it is job perfectly and easily in seconds.

This app gain popularity very fast, currently their home based is in Moskow. After Prisma produced its result, you can easily save or share social network sites like Instagram or Facebook.

Thera is about 20 art template on Prisma to choose. They use their server in the cloud to process the photos instead of processing it on the phone. They never keep the original photo even do not know who sent the picture and from where.

Their neural network is actually drawing from a blank image from our photo, so it’s like an artist and the filter is not really a filter. This is what Prisma different from others. While others make a filter from existing photo, this app creates an art from the scratch using their AI server. The result is stunning as you can see below from different picture.

prisma photo editor

Because the photo is processed on their server in the cloud, you need to keep your smartphone connected to the internet during the process.

Usually, if we want to turn sketch from your photo you are going to need professional artist help or programs that require hours to produce, with Prisma you only need seconds with an amazing result.

The minimum requirement to run Prisma picture art app
Prisma requires android 4.1 and above, only 7.1MB file installation, the current version is 1.1 and the last update was Aug 18, 2016. Camera storage and full network access is a must. The company website is prisma-ai.com

If you want to download Prisma from Google Play https://play.google.com/store/apps/details?id=com.neuralprisma&hl=en

If you want to download Prisma from App Store

Power over Ethernet (PoE): Power Injector, Power Splitter, and POE switches

Power over Ethernet (PoE): Power Injector, Power Splitter, and POE switches

Power over Ethernet (PoE) is a method to deliver electrical power to the device using existing Ethernet cable. This omits the requirement to have a power source near the device. This method is very useful when we are deploying devices that attached to a high pole or remote area when electrical power is rare especially outdoor.

PoE Injector

Not only outdoor, PoE also very useful when using indoor for esthetic and simplicity of installation. No power source needs near the device which compliant with POE standard. Devices that usually incorporate POE standard are Access Point, CCTV camera, IP telephony. We are talking about some PoE related terms like power injector, power splitter, active PoE, passive PoE, Cisco PoE and non-Cisco PoE. What they are and how we can utilize them to our IT equipment.

1. What is Power over Ethernet (POE)

POE using an unused cable in UTP/UTP cable wiring. In networking standard IEEE 802.3af pin no 4,5,7, and 8 are used to deliver power to the device. In early days these pins used for telephone cable. The cable distance between POE injector and device can up to 100 meters.

2. What is power Injector (power source)

A device that injecting power via Ethernet cable (UTP or STP). Power injector usually in form of an adaptor with 2 ports Ethernet. The 1st port connected to switch that carry data signal, the 2nd port connected to POE device and contains power 48volts. POE injector follows POE standard having 44-48 volts DC and 350mA on their port.
This adaptor is also referred to as active POE because it injects separate power using their own adaptor. The distance of UTP cable between active POE and the device can p to 100 meters. I personally recommend using this to avoid the problem.

3. What is POE power Splitter

The device that split power and data to non POE compliant devices. Below is POE splitter picture, it’s a simple connector that split between data and power. This power splitter will use existing power adaptor of a device. Maximum distance UTP cable is 30-40 meters.
This POE splitter sometime referred as Passive POE because deliver power passively to the device, they don’t ship with an adaptor. They use an existing adapter to power up the device. The longer the UTP cable it will decrease electricity current and voltage and causing a problem.

PoE switch

POE switch is a switch that has power in their ports. By using PoE switch you don’t need additional power injector. Just plug your POE compliant devices into the switch and it should ON without power adaptor. PoE switch usually used for VoIP handset but it also can be used for CCTV or Access point.

Cisco PoE Power Injector and switches

Cisco POE has slightly different cable wiring but it still compliant with PoE standard. That is why you cannot use Cisco POE adaptor to power up non-Cisco devices. You also cannot use a non-Cisco power injector to power up Cisco POE devices such as Access point and IP telephony.
By swapping cable pin in RJ-45 connector you can use it to overcome the obstacle I wrote this on other posts here.

Non Cisco PoE devices and Power Injector

Usually non-Cisco PoE brand devices interchangeably with another brand. We can be mixed with different brand between POE power injector and POE device compliant.

PoE Injector and splitter implementation

To get a better understanding of differences above, I show you below how we can implement PoE injector and splitter in the real world.

Power Injector Only

Power injector implementation is easy, no configuration required. Just plug data port on PoE injector to switch or router, you will need power outlet around for PoE injector.

Port data+power in PoE injector need to be connected to PoE device enable such as IP camera, IP phone, or Access point. Remember that not all IP camera, IP phone, or Access point are PoE enable. UTP cable from power injector to the device can up to 100 meters.

PoE Splitter only

PoE splitter is for non-PoE enable device, the installation a bit different wit PoE injector, where the other end of splitter needs to be installed near the device. The UTP distance between PoE splitter connected can up to 40 meters.

PoE injector combined with PoE Injector

PoE for injector and PoE splitter can reach up to 100 meters for non-POE device without requiring a power outlet.

There is a great product from TP link that makes it possible to extend POE injector to non-PoE powered device up to 100 meters. Using 2 devices PoE Injector TL-POE150S and PoE splitter TL-POE10R we can power up non-PoE device up to 100 away from power source. The output voltage for a device is selectable from 5,9, and 12 volts.

Computer freeze after inserting DVD in drive – Resolved

Computer freeze after inserting DVD in drive – Resolved

Server freeze after inserting DVD in the drive in the weekend ????
This is the weirdest thing I ever met, and this is ruining my weekend schedule. On Friday afternoon I just burned a DVD contains Backupexec program version 14. I download this from Symantec website as we have the license for this software.

computer crashes when cd is inserted
windows 10 dvd player freezes

Backup Exec is the best backup and restores software that we already use for years. I plan to upgrade our Backupexec program version 12.5 to version 14 remotely. This program is running on Windows server 2008 on a media server HP DL360 G5. I Insert the DVD and locked the room and went home.

At home I tried to remote access the server but I could not, after checking I found that I also cannot ping the server. This is make me wondered what happen with the server, because everything was OK when I left office this afternoon.

The next day in the morning situation still the same I still cannot ping our media server via VPN but I can ping and remote access other servers on the same rack or servers on the different room. That day is Saturday and I have to check the server in the factory which automatically ruined my weekend plan.

When I checked the server I cannot toggle on and off numeric lock key of the server’s keyboard, I can not even move the mouse. I have to push the power button for a while to shut down the server abruptly.

I restarted the server and choose safe mode, everything is working fine. I restart the server again and choose start normally and this was also working fine. I still did not realize that the server freeze because I inserted the DVD drive. I re-insert the DVD disk and hangs straight away.

Now I realized that the problem is with DVD, when I insert DVD the server was hangs, but why? If someone have bad intention just insert DVD and it will stop the server. This is so ridiculous.

The answers to problem computer hang after inserting DVD are: 

There are 2 possible solutions

  1. DVD disk scratch 
  2. DVD drive is broken,

In my case, because I just burned the image on the brand new CD disk, so we can eliminate option no 1, DVD disk scratch.

Our problem is because my DVD drive has been more than 4 years and the server was almost always on. We can replace the DVD drive or we can use USB disk to replace DVD drive function.

Since then we never getting the same error again because we always use USB disk to install new program. So if you have problem computer freeze after inserting DVD in drive, just replace the DVD drive or use USB disk. I hope this simple post will help you out.

How to Install Windows Server 2008 Standard Edition on Dell PowerEdge R530 Server

How to Install Windows Server 2008 Standard Edition on Dell PowerEdge R530 Server

Installing Windows Server 2008 Standard Edition on Dell PowerEdge R530 Server is not easy because there is no option for that operating system, the options on the screen are:
1. Microsoft Windows Server 2012
2. Microsoft Windows Server 2012 R2
3. Microsoft Windows Server 2008 R2 with SP1
4. Red Hat Enterprise Linux 6.7 x64
5. Red Hat Enterprise Linux 7.1 x64
6. SuSE Enterprise Linux 11 SP4 x64
7. SuSE Enterprise Linux 12 x64
8. VMware ESXi
9. Any Other Operating System
dell R530 server
Although Microsoft Windows Server 2008 and Microsoft Windows Server 2008 R2 with SP1 seems the same it’s totally different, the driver also different so we cannot choose option Microsoft Windows Server 2008 R2 with SP1 to install Microsoft Windows Server 2008 standard edition.

Before I succeed installing Windows Server 2008 standard I tried to use option Microsoft Windows Server 2008 R2 with SP1 and it doesn’t work. Below is the picture of error when I use lifecycle controller program to install Microsoft Windows Server 2008 standard edition using option Microsoft Windows Server 2008 R2 with SP1:

Windows failed to start. A recent hardware or software change might be the cause. To fix the problem …. followed by a different file name missing message.

The errors above proof that using option Microsoft Windows Server 2008 R2 with SP1 will never work when try installing Microsoft Windows Server 2008 standard edition.

Use manual installation and boot directly from Microsoft Windows Server 2008 standard edition DVD installation.

Read on  There are currently no logon servers available to service the logon request Error

Below are steps to successfully installing Windows Server 2008 Standard Edition on Dell PowerEdge R530 Server, I write this so that you don’t have to experience the same problems as mine.

1. RAID disk planning:

It depends on how many disks you have and how you want it to configure. We have 8 x 500GB SATA hard drives and we configured it 2 x 500GB RAID1 (mirroring) for Operating system, 5x 500GB configured as RAID5 and 1x 500GB configured as hot online spare. With above RAID configuration, our effective data volume becomes:

RAID 1 (2 disk) = 500GB

RAID 5 (5 disk) + 1 disk online spare = 2TB. So we have 2.5 TB capacity when using RAID combination above, but if we don’t use any RAID we will have  8x500GB = 4TB

Because this is a server that serves as a file server for about 300 busy peoples don’t afford to have long downtime.

If one disk fails on RAID1 (operating system) then we have other disks that will run without any performance degradation.

If one disk FAIL on RAID 5 (data ) then the online spare disk will kick in and system running without any performance degradation. If another 1 disk fail before we have a chance to replace the first broken one then we still have all data but with performance degradation. But if another one hard disk fails then we lose all data, so we have double protection here. We can have all the data if 2 hard disk fail. Although we lose the 1.5TB capacity for RAID configuration we have robust harddisk protection if one or two hard disks failed.

2. RAID disk setup

Setup RAID by pressing CTRL+R keys when the server start-up. The user interface is quite simple, you just need to highlight the controller type and then press F2 – Operation. Choose new virtual disk. Choose RAID1 (mirroring) and add the hard disk you want to include to RAID1. RAID1 need even quantity so it can be 2, 4,6, or 8 disks. Using the same interface we can create another new virtual disk for RAID 5 and add hard disk you want to include in this RAID. RAID 5 needs minimum 3 harddisk and your total hard disk capacity when using RAID 5 is n-1, where n is harddisk quantity.

3. Setup Windows Server 2008 Standard edition.

There is lifecycle controller option for assisted installation but we will not use this because our operating system is not on the list. If your Operating system on the list you can install it very easy, just follow the onscreen instruction and it will do the rest.

We need to insert bootable OS disk on the server, just follow … when you come to the screen to choose where you want to install the OS, you will not see the disk to choose, this is normal because the dick controller needs the correct driver. Download RAID controller from below, I got this URL from DELL support after I call them because I always failed to install Windows 2008 standard edition. http://downloads.dell.com/FOLDER03587450M/2/SAS-RAID_Driver_98GDG_WN32_6.603.06.00_A03.EXE

Extract to USB disk or flash disk and Plug it to the server you will need this when installing windows 2008 server.

4. Installing hard drive controller driver

This is the most important steps on successful installation, during operating system installation you come to this screen just click load driver and choose to browse and pointed to the location of RAID controller driver in the USB that you have already plugged into the server.

You will see many options of drivers, just highlight the second driver from the top and after that, you will see partition to install the operating system and choose that partition. After this stage, everything will be fine until the setup complete.

Again this is my experience with Installing Windows Server 2008 Standard Edition on Dell PowerEdge R530Server hope it helps.

Note:

There is SAS and SATA version of the Dell PowerEdge R530 Server hard drive but we choose SATA because this hard drive is easier to get and the price is also cheaper than SAS. If one of the drives need replacement in the future, we also can replace it sing SSD with the same or higher capacity. So by choosing SATA drive, we have more options to be applied.

Beware Of Covid-19 (Corona) Malware Online

Beware Of Covid-19 (Corona) Malware Online

Cybercriminals are using the current pandemic situation of Coronavirus for their own advantages, this is bad behavior. They offer information and fake news designed to steal your personal information when you open or click the link they sent.

Please only trust information comes from authority organizations like World Health Organization (WHO). They provide up to date information about the Covid-19 pandemic and tips to stay safe. John Hopkins University also provides the world map about pandemic spread from their website here: https://coronavirus.jhu.edu/map.html

Back to malware that uses this pandemic for their profits, this is five steps how to avoid them from stealing your personal information:

  1. Check your sources and only refer ones with a good reputation for accuracy and verifiable facts.
  2. Please be reminded again that you should not click any links from unknown emails.
  3. Don’t open attachment even from someone you already know, check first whether they really sent the attachment or not. This is a hassle but needs to be done.
  4. Check the website if it contains an additional number, typo or anything that suspicious, many of them change O to zero number or vice versa to deceive you.
  5. Think about how they shared, information from social media like Facebook, Twitter, or Whatsapp can be written by anyone.

Email Targetted To The Industry

This type of email sent to healthcare industries, transportation, manufacturing, and others, when the attachment file opened, malware will steal sensitive data.

World Health Organization Email

This is an example of a phishing email targetted to Italian email addresses. The emails contain attachment about steps to stop the virus spread. Once the attachment opened it will compromise the device and harvesting information.

Remote Worker Emails Scam

Many companies around the world encouraged their employee to work from home. Cybercriminals getting this information and they sent emails pretending from the company and asking employees to sign to DocuSign or online seminar in order to steal information.

Coronavirus map

Clone of John Hopkins map of the virus spreading, it seems valid but it only a trick from cybercriminals to steal personal data browser line credit card information.

We hope this information will help you avoid scam from cybercriminals that take advantage of this pandemic. Stay healthy and stay safe online.

How To Fix Corrupted SD Card

How To Fix Corrupted SD Card

There are many reasons that your micro SD card can become corrupted. It can be caused from the operating system crash, virus attack, accidentally deleted files, accidentally formatted SD card, or it cannot be read at all.

Micro SD usually additional memory chip for smartphones, cameras, music player, CCTV and more. The content of SD card could be photos, videos, audios, and other documents.

How To Fix Corrupted SD Card 1

Why using Micro SD card

The ultimate reason to add a micro SD card to a smartphone is to make more space on the built-in internal memory when your internal memory had enough free space, the smartphone will perform well and we can install software and take more photos.

If you have a lot of internal memory on your smartphone, you do not need

How to Repair Micro SD card without a program

If you do not have any open source (free) or commercial recovery software (Paid), you can try manual SD card recovery as below:

– Use a pencil eraser to clean up contact pin on SD card

If your SD card is unreadable you can try to remove SD card from your device and clean up all dirty contact pin using the pencil eraser. Make sure the surface is clean from dirt and re-insert SD card to your device and see if its work.

– Using CHKDSK tools

Using CHKDSK may only retrieve some of your files if the corrupted was severe. Cards with corrupted data will get any recovered data stored in the folder lost.dir in the SD card’s list of folders
How to Repair Micro SD card using a free recovery program

The one that really free is open source project, I compile some of the open source free program for data recovery:

Test disk. http://www.cgsecurity.org/wiki/ TestDisk available on Windows, Mac, and Linux. Although the interface is not GUI, this program is powerful. No installation required, just extract and run the file.

How To Fix Corrupted SD Card 2

Recuva (pronounced as recover)

https://www.piriform.com/recuva is free and paid version.
How to Repair Micro SD card using paid recovery program

If you are looking for free Sandisk data recovery software on the internet you will get tons of result. Most of them are a free trial, means at some point you going to pay before recover big amount of data. This is still good if you have under 2GB data to recover.
SanDisk RescuePRO and RescuePRO Deluxe

Sandisk is the big name in memory chip business have their own data recovery program. RescuePRO Standard for PC One Year Subscription start from USD39.9

Use the trial version to make sure that the program can detect the files you want to recover. http://www.lc-tech.com/pc/sandisk-rescuepro-and-rescuepro-deluxe/ This will recover all type of Sandisk memory as well as other.
EaseUS data recovery software

This is my favorite, EaseUS data recovery software http://www.easeus.com/data-recovery-software/ . Free 500MB Data recovery, when you share via facebook, twitter, or google plus you will get another 1.5GB free recovery. In total you will get 2GB of data recovery for free. If you find it useful and need bigger data to recover you will need to buy the license start from USD 69.95
CardRecovery v6.10

https://www.cardrecovery.com/ Recover Photo, Video, Audio files for phone and digital camera. The price is USD 39.95 per copy, 2 years free upgrade and no monthly or yearly fee. The evaluation version can preview the file but if you want to restore you need to buy the software.

I hope you find this post about how to fix a corrupted Micro SD card is useful, do not forget to share this article.

Delete, Clear, and Refresh ARP Cache

Delete, Clear, and Refresh ARP Cache

ARP (Addrеѕѕ Resolution Protocol іѕ the ѕtаndаrd mеthоd for fіndіng a hоѕt’ѕ hardware аddrеѕѕ whеn оnlу its nеtwоrk lауеr address is knоwn. In other wоrd, in IPv4 аnd Ethеrnеt network еnvіrоnmеnt, Wіndоwѕ operating system uѕеѕ ARP tо trаnѕlаtе IP addresses tо Ethеrnеt MAC аddrеѕѕеѕ.

Example

Twо соmрutеrѕ іn an office (Cоmрutеr 1 аnd Computer 2) аrе connected to each оthеr іn a local area nеtwоrk bу Ethеrnеt саblеѕ and nеtwоrk switches, wіth nо іntеrvеnіng gateways оr routers. Cоmрutеr 1 hаѕ a расkеt tо ѕеnd tо Computer 2. Thrоugh DNS, it dеtеrmіnеѕ that Computer 2 hаѕ thе IP аddrеѕѕ 192.168.0.55.

Tо ѕеnd the mеѕѕаgе, іt аlѕо rеԛuіrеѕ Cоmрutеr 2’s MAC address. First, Cоmрutеr 1 uѕеѕ a сасhеd ARP tаblе tо lооk uр 192.168.0.55 for аnу еxіѕtіng rесоrdѕ оf Cоmрutеr 2’s MAC аddrеѕѕ (00:eb:24:b2:05:ac). If thе MAC address іѕ fоund, іt sends аn Ethеrnеt frame wіth dеѕtіnаtіоn address 00:еb:24:b2:05:ас, containing the IP расkеt onto thе lіnk. If thе cache did nоt produce a rеѕult for 192.168.0.55, Cоmрutеr 1 has to send a brоаdсаѕt ARP request mеѕѕаgе (dеѕtіnаtіоn FF:FF:FF:FF:FF:FF MAC аddrеѕѕ), whісh is ассерtеd bу аll соmрutеrѕ оn thе local network, rеԛuеѕtіng аn аnѕwеr fоr 192.168.0.55.

Cоmрutеr 2 rеѕроndѕ with аn ARP response message containing іtѕ MAC and IP аddrеѕѕеѕ. As раrt оf fіеldіng thе request, Cоmрutеr 2 mау іnѕеrt аn еntrу for Cоmрutеr 1 іntо іtѕ ARP tаblе fоr future use.

Cоmрutеr 1 receives аnd сасhеѕ thе rеѕроnѕе information in іtѕ ARP table аnd can nоw ѕеnd thе расkеt.

However, Microsoft Wіndоwѕ ARP cache will occasionally bесоmе соrruрt аnd need to be сlеаrеd and deleted ѕо thаt thе cache can bе refreshed.
If you’re encountering рrоblеm соnnесtіng to Intеrnеt whеrе соnnесtіоnѕ tо websites оr wеb раgеѕ wіll time out or fаіl, and unаblе to ѕurf оr brоwѕе thе Internet раgеѕ, thе еrrоr mау because аlѕо оf ARP cache corruption, other than TCP/IP corruption оr Wіnѕосk error.

Tо confirm thаt іt’ѕ іndееd аn ARP іѕѕuе, try to ping bоth thе lоорbасk аddrеѕѕ (127.0.0.1) аnd thе lосаl соmрutеr’ѕ IP address. Thеn trу tо аnу оthеr IP аddrеѕѕеѕ ѕuсh аѕ thоѕе оf Gооglе.соm оr Yahoo.com. If you can ping tо local IP address аnd lоорbасk аddrеѕѕ, but nоt any other IP addresses, then thіѕ іѕ the tурісаl symptom оf ARP сасhе fаіlurе.

Use the NetShell (nеtѕh) command tо clear, delete оr refresh thе Addrеѕѕ Resolution Prоtосоl (ARP) cache bу fоllоwіng thе fоllоwіng ѕtерѕ.

Clісk on Start buttоn.
Click оn Run соmmаnd аnd type Cmd into thе Run tеxt bоx, аnd thеn рrеѕѕ Enter. For Windows Vіѕtа оr lаtеr OS, type Cmd іn Stаrt Search, аnd thеn рrеѕѕ Ctrl-Shift-Enter kеуbоаrd ѕhоrtсut tо force Administrator рrіvіlеgеѕ. Entеr Admіnіѕtrаtоr uѕеr ID аnd раѕѕwоrd and allow аnу permission rеԛuеѕt when prompted.
In the Command Prоmрt window, tуре thе fоllоwіng command thеn рrеѕѕ Entеr.
nеtѕh interface ір dеlеtе аrрсасhе
The command wоrkѕ іn all Windows vеrѕіоnѕ.

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