Using a GPS to perform a Wi-Fi survey

It is important to perform a wi-fi survey so that you can determine not only the perfect place to locate your access point or bridge but to gain an understanding of the channel co-existence challenge you may face.  With wireless access points in surrounding neighborhoods and businesses, you will need to  perform a survey by walking around and mapping out the BSAs (Basic Service Area) of wireless that surrounds you and your organization.

Below is an example of our school’s perimeter.  Matt, Chris and James, students in the Computer Information Technology, class performed a survey using a Microsoft GPS and Vistumbler.  This survey revealed access points and their channels of current wireless at our institution and  includes APs in surrounding businesses and neighborhoods.  These were mapped using Google Earth after exporting their KML file from Vistumbler.

This type of survey allows IT professionals to analyze data exported to ensure the correct channels can be used at their organization.

Miller Goodroe Felts

After exporting the wireless information, you can analyze each access point or wireless device by clicking on it.  Below is an example of the information exported into Google Earth.   Each device shows SSID, Network Type, Mac Address, Channel, Security, Encryption Type, Data Rates, Latitude, Longitude and Manufacturer information.   Analyst using this information can also determine the best placement of wireless devices along with channel information.

ESSID Expanded

Channel co-existence is when access points share channels that are very close to one another.

802.11 wireless on 2.4 Ghz has three non-overlapping channels.  These channels are 1, 6 and 11.  The closer channels are, the more likely interference will take place.  With the amount of wi-fi in use today, IT professionals have to chose between 2.4 Ghz and 5 Ghz and and try to select channels that are not in use if possible.   Professional access points and bridges can also adjust power as necessary.   A dense population can make this very challenging.

If you look at the students’ survey by zooming out to see how many access points can be seen, this is what you are looking at!  Now you can see why site surveys are important at your organization.

Exploded

In addition to this survey, a secondary survey using a spectrum analyzer is very important to search for interference from other sources.  (See our review of the Airview Spectrum Analyzer)

analyzer-software

Channel information (Chart from Wikipedia)

NonOverlappingChannels2.4GHzWLAN-en.svg

Here’s another look at a wireless survey showing vertical lines and signal strength.  (James M. KML survey)

Another view James Miller KML

Add GeGeek Toolkit to Hiren’s CD/DVD for the ultimate troubleshooting tool

One of the best sites on the web is GeGeek.  GeGeek has over 300 tools (freeware) that you can download for troubleshooting any computer.   How can it possibly get more powerful?

Use Rufus USB to create a bootable ISO of Hiren’s CD/DVD’s ISO.  See our other article – link.  Once you create the bootable flash drive, copy the GEGeek folder to

Now when booting to your USB drive, you can boot into Windows XP mini and navigate to the flash drive.  Navigate further into the Prorams folder and then into the GEgeek folder.  You can now use any tool you need to troubleshoot or diagnose your computer.

GEGeek Toolkit

Over-Provisioning and SSDs

Over-provisioning is the allocating of a specific amount of free space on your SSD.  Over-provisioning improves SSD endurance and performance.   Many SSDs are packaged with software that helps the end user install the drive and to plan for OP.  (More advanced drives are doing away with OP).

The SSD controller manages all of the data that is stored on the drive.  While these drives are really fast, data writes are not just placed on the drive.  Data is moved around and the controller on the drive is programmed to use the drive evenly across the NAND blocks.   By moving the data around, the controller can use the free space (OP) to swap information as needed.     This in turn adds life to your SSD.  Always update your SSD firmware, use the manufacturer’s software for OP if your drive recommends it and don’t forget to trim your hard drive.  TRIM allows for the removal of junk or old data.  How? Easy – Open a command prompt (as Admin)

Type the following - fsutil behavior set DisableDeleteNotify 0

Over-provisioning in Samsung Magician’s software.

OP

Always load the drivers – Below is Intel Drivers on my laptop vs. Windows 8 generic drivers

drivers

Windows 8.1 SSD Optimization

If you have install an SSD to Windows 8 or 8.1, and you aren’t sure if the OS is optimized for an SSD. Here’s the fastest way to make sure it is optimized.

Open a CMD prompt as an Administrator
Run winsat formal
Defrag will remain on, that’s right, on. After ‘seeing’ the SSD, this tool (defrag) will become optimize and will trim your SSD.
Of course AHCI should be on, over provisioning accounted for and the proper chipset drivers loaded.

Configuring WDS to extend your wireless network

Want to extend your network and make it more reliable and robust?   

Here’s what you will need -

  • Two routers with the same firmware
    • Preferably Tomato or DD-WRT

Login to the first router.  

In this example, the static number 192.168.1.1 is the Main router.

  • Enable the WAN to match your ISP  
  • Enable DHCP
  • Enable Access Point + WDS  (Picture two below)
    • You must have the same wireless configuration on both routers
      • Enter the MAC address of router two under WDS Link with.

Router 1 no 1

Router 1 no 2

Login to the second router

  • Disable the WAN
  • Disable DHCP
  • Assign the router a static IP address (Below we have given the router .250)
  • Enter Router One’s IP Address for the Gateway
  • Enter a DNS of your choice
  • Make the wireless configuration the same as the first router.  Under WDS, change the drop down to automatic.

Router 2 no 1

Router 2 no 2

With the same settings, you can now extend your network several hundred feet under the right conditions.  Because the SSIDs are the same, once you join one of the routers with a smartphone or laptop, it will seamlessly change to the stronger signal.

With Tomato, you can chain together approximately 12 devices.

Links-

Tomato RAF

Shibby’s Tomato

DD-WRT

Note; The IP addresses and MAC addresses are in a lab environment.

How does it look on a network map?  The two routers are actually connected together.  The switch is the four ports on the back of the router closest to the internet.

Map

Use DISM to Fix Component Store Corruption in Windows 8 or Windows Server 2012

Sign in as the Administrator on your computer.  If you do not see the administrator account, enable the administrator account.  If you are using a home version, you will need to go to an elevated command prompt and type the following -

net user administrator /active:yes

After logging in as the administrator, type the following at an elevated command prompt-

Dism /Online /Cleanup-Image /RestoreHealth

Note:  Your computer may appear to hang – wait, it will take time

Reboot after running the DISM command.

How to tie your cloud storage services together

How can you tie your cloud storage services together?   It’s actually easy if you use MultCloud.   MultCloud ties together all of the most popular cloud storage services so you can upload files to multiple sites through a single sign-on.

Completely FREE app for home and commercial use.
Single login for multiple cloud accounts.
Add unlimited accounts such as Dropbox, Box, OneDrive, etc

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Add Cloud

Signing up is easy and free.   Once you sign in, you can connect your cloud services and use the power of MultCloud to Upload or Download files from a central dashboard.

services