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What is iperf, jperf and xjperf? How can you use them to test network performance?

1ve0 — Thu, 16 Feb 2012 23:29:17 +0000

Iperf is a very helpful tool written in C++ to measure network bandwidth and quality. It can be used to analyze both TCP and UDP traffic.

Jperf or Xjperf (both of them are the same thing. Don’t confuse about the difference) equip Iperf with graphical interface. If you don’t like to spend your time by command line, use Jperf.

I am going to give you some information about Iperf and Jperf. First of all, the project links of these tools are here:

Iperf: http://sourceforge.net/projects/iperf/
Jperf: http://sourceforge.net/projects/jperf/

Quick Iperf Example:

Iperf is an “exe” file (I am talking about Windows of course. If you are wonder about Iperf on Linux, see last section of this article). Download this exe file by here or here. Open a command prompt (Start > Run > cmd). Go to folder which exe file is in.

We are beginning to study Iperf

It can be used as server or client. I mean the same exe file can be server or client.

To use Iperf as server, use:
```
iperf -s
```
To use Iperf as client, use:
```
iperf -c IPaddress
```

Iperf as server

Iperf as client

As you see above, average bandwidth is 13.0 Mbits/sec in this example. To find out that, Iperf has sent 15.5 MBytes in 10 seconds.

We are going deep in Iperf:

Indeed, Iperf is not easy as It seems. There are almost 30 commands for Iperf. To see all commands, use this command:

iperf --help

Iperf commands

In this case, we want to test our download and upload speed for TCP by specific windows size, interval and time.

Testing download speed:

Here is the environment:

Computer1 (main computer in the office that we want to test download/upload speed in)
Laptop2 (remote computer in another office)
Windows size: 384 KB
Interval: 1 second
Time: 20 seconds

The key point is client sends packets to server (Client generates network traffic). So:

If you want to see download speed for Computer1, you should configure it as Iperf server. Thus Computer2 sends packets to Computer1. Computer1 receives/downloads these packets.
If you want to see upload speed for Computer1, you should configure it as Iperf client. Thus Computer1 sends packets to Computer2. It means Computer1 uploads these packets.

Testing download speed for Computer1

Write these commands for the test:

On Computer 1:
```
iperf -s
```
On Computer 2:
```
iperf -c IPaddress -i 1 -t 20 -w384K
```

Do not forget to write your IP address instead of IPaddress!

After that, command lines are going to be like that:

After TCP download test for Computer 1. This screenshot is from Iperf client (Computer 2)

After TCP download test for Computer 1. This screenshot is from Iperf server (Computer 1)

As you see, totally 29.2 MB has been sent in 10 seconds. Average speed is 24.3 Mbits/sec.

Testing upload speed:

The environment is going to be the same with “testing download speed” section but iperf server and client computers should change.

Testing upload speed for Computer1

Write these commands for the test:

On Computer 1:
```
iperf -c IPaddress -i 1 -t 20 -w384K
```
On Computer 2:
```
iperf -s
```

Do not forget to write your IP address instead of IPaddress!

After that, command lines are going to be like that:

After TCP upload test for Computer 1. This screenshot is from Iperf server (Computer 2)

After TCP upload test for Computer 1. This screenshot is from Iperf client (Computer 1)

As you see, totally 12.6 MB has been sent in 10 seconds. Average speed is 10.4 Mbits/sec.

UDP Test:

You need to “-u” parameter for UDP test. You can see jitter (delay correlation) and data gram. Here is a quick example.

UDP test result of Iperf client

UDP test result of Iperf server

Iperf on Linux:

To install Iperf on Linux, use these commands:

wget http://78.40.227.80/~depo/iperf-2.0.5.tar.gz
tar xvfz iperf-2.0.5.tar.gz
cd iperf-2.0.5
./configure
make
&& make install

Commands are the same as commands on Iperf Windows version. Just be aware of default windows packet size (It is 85.3 KB).

Iperf on Linux

Jperf:

Jperf installation is as easy as regular program installation on Windows. Just you need to JDK or JRE first of all.

Download Jperf for Windows by here. Extract it.
Download JRE or JDK by here.
Click to “jperf.bat” in Jperf folder.

Jperf UI

Notes:

Use “-P” parameter for paralel test.
If you want to save Iperf output, add this command at the end of line: “> c:\output.txt”. For example:

iperf -c IPaddress -i 1 -t 20 -w384K > c:\output.txt

Enjoy!

If you have any question, send a comment guys. I am working hard with Iperf nowadays.

Which FTP client is better: FileZilla, CuteFTP or TotalCommander?

1ve0 — Thu, 16 Feb 2012 05:27:03 +0000

Most people think that FTP speed depends on server and network speed. How about FTP client? Which FTP client should you prefer If you need high speed?

Which one is the best?

I tested three FTP clients:

FileZilla 3.5.3
CuteFTP 8.3.2
Total Commander 7.55

Here is test environment:

Operating system: Windows 7 Ultimate
FTP Server speed: 30 Mbps (download), 140 Mbps (upload)
Network speed: 32 Mbps (download), 2 Mbps (upload)

I have tried download/upload three times and calculated average. All clients have had the same conditions. The results:

FTP clients comparison

* I used multi-part download and normal upload on CuteFTP. I used default settings on FileZilla and Total Commander.
* Passive mode was used for both download and upload (Find out more).

As a result:

Don’t use Total Commander! Upload speed of Total Commander is terrible!
If you like open source programs choose FileZilla.
If you like programs that have user-friendly interface, choose CuteFTP.

By the way, my favorite is CuteFTP!

How Google earned USD 37.9 Billion in 2011?

1ve0 — Thu, 02 Feb 2012 01:16:50 +0000

USD 37.9 Billion in a year! The most interesting thing is %96 of the revenue comes from Adwords. That’s why we see advertisements on whole Googles services like Gmail, Search, Documents etc.

Check this out:

Google Revenue Infographic

Excel Macro which copies one column to another by matching specific unique column

1ve0 — Wed, 25 Jan 2012 00:37:52 +0000

This is a simple Excel Macro which copy one column to another by comparing specific unique column. There two sheets: Sheet1 and Sheet2. We copy column 2 and 3 at Sheet2 to column 2 and 3 at Sheet1 by matching column 1 at both.

There might be persentage data. You should use NumberFormat parameter in that situation.

Sub CopyCells()
'*** Defining variables ***'
 Dim Value1, Value2
 Dim RowsCount1, RowsCount2
'*** Find out rows count ***'
 RowsCount1 = Worksheets("Sheet1").Range("A1").CurrentRegion.Rows.Count
 RowsCount2= Worksheets("Sheet2").Range("A1").CurrentRegion.Rows.Count
'*** Copying data ***'
 For C1 = 2 To RowsCount2
..Set Value1 = Worksheets("Sheet2").Cells(C1, 1)
..For C2 = 3 To RowsCount1
 ....Set Value2 = Worksheets("Sheet1").Cells(C2, 1)
 ....If Value1 = Value2 Then
 ......Worksheets("Sheet1").Cells(C2, 2) = Worksheets("Sheet2").Cells(C1, 2)
 ......Worksheets("Sheet1").Cells(C2, 2).NumberFormat = "0.00%"
 ......Worksheets("Sheet1").Cells(C2, 3) = Worksheets("Sheet2").Cells(C1, 3)
 ......Worksheets("Sheet1").Cells(C2, 3).NumberFormat = ""
 ....End If
 ..Next C2
 Next C1
End Sub

.
C1 and C2 mean Counter1 and Counter2.

How to synchronize Google Calendar and Outlook?

1ve0 — Tue, 24 Jan 2012 23:27:25 +0000

If you want to sync Google Calendar and Outlook, Google Calendar Sync tool is all you need. There are 2-way and 1-way synchronizing alternatives. Try it:

http://dl.google.com/dl/googlecalendarsync/googlecalendarsync_installer.exe

Google Calendar Sync tool

If you have Google Apps for Business (I mean you pay for the service), you can use an excellent tool that name is Google Apps Sync for Outlook. It provides mail, calendar, contact, free/busy data syncronization capability.

http://www.google.com/apps/intl/en/business/outlook_sync.html

Lastly, if you bored of Outlook (How can it be possible?) and want to move whole data to Google Apps, Migration Tool is for you:

http://tools.google.com/dlpage/outlookmigration

What do “Domain Name Status Codes” mean?

1ve0 — Sun, 22 Jan 2012 23:31:50 +0000

You might have diffuculty understanding domain name status codes because there are quite a lot of codes. Look at the list and figure.

ACTIVE: A domain can only be modified by the domain registrar.
REGISTRY-LOCK: The domain can not be modified or deleted by the registrar. The registry must remove the REGISTRY-LOCK status for the registrar to modify the domain.
REGISTRAR-LOCK: The domain can not be modified or deleted. The registrar must remove REGISTRAR-LOCK status to modify the domain.
REGISTRY-HOLD: The domain can not be modified or deleted by the registrar. The registry must remove the REGISTRY-HOLD status for the registrar to modify the domain.
REGISTRAR-HOLD: The domain can not be modified or deleted. The registrar must remove REGISTRAR-HOLD status to modify the domain.
REDEMPTIONPERIOD: The registry sets this status when a registrar requests that the domain name be deleted from the registry and the domain has been registered for more than 5 calendar days (if the delete request is received within 5 days of initial domain registration it will instead be deleted immediately). The domain will not be included in the zone. The domain can not be modified or purged; it can only be restored. Any other registrar requests to modify or otherwise update the domain will be rejected. The domain will be held in this status for a maximum of 30 calendar days.
PENDINGRESTORE: The registry sets this status after a registrar requests restoration of a domain that is in REDEMPTIONPERIOD status. The domain will be included in the zone. Registrar requests to modify or otherwise update the domain will be rejected. The domain will be held in this status while the registry waits for the registrar to provide required restoration documentation. If the registrar fails to provide documentation to the registry within 7 calendar days to confirm the restoration request, the domain will revert to REDEMPTIONPERIOD status. The domain status will be set to ACTIVE only if the registrar provides documentation to the registry within 7 calendar days to confirm the restoration request.
PENDINGDELETE: The registry sets this status after a domain has been set in REDEMPTIONPERIOD status and the domain has not been restored by the registrar. The domain will not be included in the zone. Once in this status all registrar requests to modify or otherwise update the domain will be rejected. The domain will be purged from the registry database after being in this status for 5 calendar days.

How domain names expire?

The source: http://www.registercompass.com/wiki/domains/pendingdelete.aspx

Installing Android applications to SD card directly

1ve0 — Fri, 20 Jan 2012 02:28:20 +0000

If you have an Android phone, You see that every applications that you download from Adroid Market install Internal Memory automatically. If your Internal Memory is small, this situation is very big problem for you. Probably you look for a solution to install applications External Memory (SD Card) directly.

There are a lot of applications that claim to fix this issue. I have tried almost 10 applications but none of them succeed. Then, I found another way to do that. Here is:

Download & Install Android SDK.
Open Commant Prompt (Start > Run > cmd).
Go to this folder: “C:\Program Files (x86)\Android\android-sdk\platform-tools”.
Connect your cellphone to the computer via USB.
Install your cellphone application like HTC Sync for HTC cellphones.
Activate “USB debugging” on the phone (Menu -> Settings -> Applications -> Development -> Check USB Debugging)
Go back to Command Prompt. Try this command: “adb devices“. You will see attached cellhphones.
Then run this command: “adb shell pm setInstallLocation 2“.
That’s all. After that time, your applications will be installing your external memory.

How can you connect to TEMS Investigation 13.1 using HTC smartphone?

1ve0 — Tue, 17 Jan 2012 12:07:07 +0000

To collect WCMDA or LTE signal logs you could use a scanner or data cards. There is another way to do that: using smartphone. It is easy and feature-filled.

Firstly, we have these tools for this work:

TEMS Investigation 13.1 on Windows 7
HTC Vivid (PH39100)
USB cable

I will tell you how you can do that step by step. Please read whole article before practising that.

Here we go:

Plug in USB cable to the computer and HTC.
On HTC, open “HTC SSD Test“. You must enable these features on HTC:
- Control Diag Port
- Control Modem
- Control RmNet
  
  HTC SSD Test Tool
Open “Device Manager“. Did you see these HTC drivers? If you did, continue with Step 3. If you didn’t, try unplug/plug, restart, reinstall drivers etc. It is a regular driver installation problem (If your manufacturer gives you special drivers, don’t forget to use them). I suggest that a program for this work: USBDeview. You can easily install/uninstall your USB devices with using that program.
- HTC USB Modem
- HTC Ethernet Adapter – 9k #2
- HTC Diagnostic Interface – 9K (COMx)
- HTC Diagnostic Interface (COMy)
  Device Manager after HTC driver installation
Open “TEMS Investigation 13.1“. Create a new workspace or open a previous workspace.
Probably It will not recognize HTC automatically. If It happens, don’t worry. You can still do that. Just you need to create a manual configuration. Click to lovely little “Start Manual UE Config” button. Then create a manual configuration as It has been shown below. You should choose device type and ports settings carefully. Read your device’s documentation for that.
Manual Configuration on TEMS
Restart TEMS Investigation and HTC. Unplug and plug in USB cable.
Finally, open TEMS Investigation while HTC connected to the computer via USB. Here we are:
HTC on TEMS

Enjoy!

Formatting Windows on the computer which has two harddisks

1ve0 — Sat, 14 Jan 2012 00:39:05 +0000

Formatting Windows is generally easy because most computers have only one harddisk. If you try to format on the computer which has two harddisks, you might experience an error like this:

Setup was unable to create a new system partition or locate an existing system partition. See the Setup log files for more information.

To manage this problem, you should unplug one of your harddisks. Probably one of your harddisks is SSD. You should unplug that. After you install Windows, you can plug in it again.

Understanding offline files

1ve0 — Tue, 13 Dec 2011 06:47:12 +0000

If you would like to use files where are at network share, you should be connected to access these files. If you aren’t connected/online, you cannot access your files. Actually, You couldn’t… Now, you can!

Using offline files gives you ability to connect your files at network share when you are offline. To activate this feature in Windows 7, right-click the file or folder, and then click “Always Available Online“. That’s all!

By the way, you cannot use that feature in Windows 7 Starter or Home Premium. You need to Professional or Ultimate. To see Windows versions comparison table, click here.

More information about offline files.