tcping with Windows QuickStart Tony Fortunato, Network Performance Specialist The Technology Firm

What is tcping? tcping is; Go get it at http://www.elifulkerson.com/projects/ Portable, command line utility - no installation Unlike other PING tools, tcping sends TCP SYN packets to the remote computer on specific TCP port numbers.

tcping is;

Go get it at http://www.elifulkerson.com/projects/

Portable, command line utility - no installation

Unlike other PING tools, tcping sends TCP SYN packets to the remote computer on specific TCP port numbers.

Why use tcping? tcping can be used for the following tasks; To check connectivity when; ICMP, or ping is not allowed to the destination Multiple paths maybe used for different port numbers Measures the time (in milliseconds) it takes for a packet to travel from your computer to a specified destination, with the accuracy of three decimal places. Change the interval between tcping packets You can even enable a beep to let you know when the destination is up, or down

tcping can be used for the following tasks;

To check connectivity when;

ICMP, or ping is not allowed to the destination

Multiple paths maybe used for different port numbers

Measures the time (in milliseconds) it takes for a packet to travel from your computer to a specified destination, with the accuracy of three decimal places.

Change the interval between tcping packets

You can even enable a beep to let you know when the destination is up, or down

Starting tcping To start the tcping utility you must open the folder in the command prompt. If you have the Windows Powertoy, simply right click on the tcping folder and then open in command prompt. Once the command prompt opens into the tcping folder, type tcping on the command line to view the options. C:Documents and SettingsTony FortunatoDesktopoffice cping>tcping -------------------------------------------------------------- tcping.exe by Eli Fulkerson Please see http://www.elifulkerson.com/projects/ for updates. -------------------------------------------------------------- Usage: tcping [-t] [-d] [-i interval] [-n times] server-address [server-port] -t : ping continuously until stopped via control-c -n 5 : for instance, send 5 pings -i 5 : for instance, ping every 5 seconds -d : include date and time on each line -b 1 : enable beeps (1 for on-down, 2 for on-up, 3 for on-change, 4 for always) If you don't pass server-port, it defaults to 80.

To start the tcping utility you must open the folder in the command prompt.

If you have the Windows Powertoy, simply right click on the tcping folder and then open in command prompt.

Once the command prompt opens into the tcping folder, type tcping on the command line to view the options.

tcping Accuracy When I used the utility to tcping my local router and got over 1 millisecond, I had to double-check with my protocol analyzer Not sure how it calculates its response time, so I wouldn’t trust this part of the utility until I can figure out the time calculations

When I used the utility to tcping my local router and got over 1 millisecond, I had to double-check with my protocol analyzer

Not sure how it calculates its response time, so I wouldn’t trust this part of the utility until I can figure out the time calculations

tcping interval option -i The –i option will tcping at the provided interval value

The –i option will tcping at the provided interval value

tcping interval option -d The –d option will display the date and time Great for batch files

The –d option will display the date and time

Great for batch files

tcping with Errors and Timeouts In the example below a tcping checking 10.44.10.1 for TCP port 23, which is not supported, resulting in Connection refused messages

In the example below a tcping checking 10.44.10.1 for TCP port 23, which is not supported, resulting in Connection refused messages

tcping with Errors and Timeouts In the example below a tcping checking 10.44.10.11 for TCP port 23 This host is not up, resulting in a Connection timed out message

In the example below a tcping checking 10.44.10.11 for TCP port 23

This host is not up, resulting in a Connection timed out message

tcping with Errors and Timeouts In the example below tcping checked host 10.44.10.108 for TCP port 80 This webserver was up, but crashed, resulting in the following messages below

In the example below tcping checked host 10.44.10.108 for TCP port 80

This webserver was up, but crashed, resulting in the following messages below

In Closing… Pro’s Able to check TCP port numbers Has time display option Like the beep Interval option Con’s Response time measurement not accurate No ability to test UDP port numbers Would I use it? Yes, since I can not find a command line tool to ping tcp port numbers and live with the Con’s

Pro’s

Able to check TCP port numbers

Has time display option

Like the beep

Interval option

Con’s

Response time measurement not accurate

No ability to test UDP port numbers

Would I use it?

Yes, since I can not find a command line tool to ping tcp port numbers and live with the Con’s

tcping with Windows QuickStart Thank you Tony Fortunato, Network Performance Specialist The Technology Firm

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For additional educational videos on Open Source Network Tools, please click on the following …

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