Tony Fortunato is a Senior Network Specialist with experience in design, implementation, and troubleshooting of LAN/WAN/Wireless networks, desktops and servers since 1989. His background in financial networks includes design and implementation of trading floor networks. Tony has taught at local high schools, Colleges/Universities, Networld/Interop and many onsite private classroom settings to thousands of analysts.
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1. tcping with Windows QuickStart Tony Fortunato, Network
Performance Specialist The Technology Firm
2. 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.
3. 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
4. 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 FortunatoDesktopofficecping>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.
5. 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 wouldnt
trust this part of the utility until I can figure out the time
calculations
6. tcping interval option -i
The i option will tcping at the provided interval value
7. tcping interval option -d
The d option will display the date and time
Great for batch files
8. 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
9. 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
10. 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
11. In Closing
Pros
Able to check TCP port numbers
Has time display option
Like the beep
Interval option
Cons
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 Cons
12. tcping with Windows QuickStart Thank you Tony Fortunato,
Network Performance Specialist The Technology Firm
13.
For additional educational videos on Open Source Network Tools,
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