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1997-04-10
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Digital Telecom Department
Faculty of Applied Sciences
Free University of Brussels (VUB)
Pleinlaan 2
1050 Brussels
BELGIUM
e-mail: piing@info.vub.ac.be
PIING v. 0.9
------------ Author of Piing v. 0.9: J. Kuypers
Piing is a program for network delay measurements. It is an extension of the normal ping
program as it can ping several hosts at the same time. Piing measures the roundtrip time
it takes for a packet to reach a host on the Internet and return, in the same way as a normal
ping program does: it sends an ICMP (Internet Control Message Protocol) ECHO-REQUEST
message to a host and the receiving host replies with an ECHO-REPLY message. The difference
in sending and receiving time gives the roundtrip time.
Piing can ping multiple hosts (up to ten, in this version) and display the timing results
graphically. The start and stop time at which pinging should start can be set for each host
seperately. Piing will then start pinging the host on a user-specific interval (e.g.: 3 min).
To get an accurate result of the roundtrip time at each interval, Piing sends a number of
consecutive ping messages (e.g.: 30), for every small-scale interval (e.g.: every second) and
avarages them out.
Piing also records the loss rate (number of packets lost / number of packets send).
Piing also lets you set alarm conditions on the loss rate. When a certain loss rate or round-
trip time is exceeded, Piing displays a dialog box on the screen, notifying you of the problem.
Use the Piing-Add Host menu item to add a host to the grid. All the options can be set in this
dialog box.
The results can be displayed graphically in the window next to the grid. Just select a number
of fields you want to see displayed and select the type of graphic you want to see.
In case of a Time Evolution Plot, you can see how the measured values (Min RTT, Mean RTT,
Max RTT and Loss Percentage) evolve in time for one host. Just select one or more of this fields
for one single host.
The Barplot graphics types (2D and 3D) allow you to compare several hosts. Select the values you
want to compare for each of these hosts in the grid, and they will be displayed in the graphics
window next to the grid.
The values and graphics will be updated automatically at every interval, as new results come
in.
Installing Piing
----------------
Make sure grid.vbx is copied into the \windows\system subdirectory.
As Piing must be able to send ICMP messages, it needs a winsock that is able to work with
RAW sockets. This sort of socket is not mandatory for winsockets, so Piing will not work
with all winsock dll's. You must have a winsock.dll that supports raw sockets, e.g.
Trumpet Winsock.
NOTES:
- because of a limitation of Windows 3.1, the timer resolution is limited to 55 ms. This
makes this tool -at this moment- not suited for measurements on a LAN.
- Piing will generally not begin immediately with pinging the hosts, but wait until a time
interval begins. For example, when you put 3 min in the Interval field (Large Scale
Measurements) in the Add Host dialog box, you will have to wait 1.5 min on average before
the pinging starts.
- Piing sends a UDP when it starts, just to let us know whether this program is being used!
WE WOULD LIKE TO HEAR FROM YOU
------------------------------
This is only a test version of the program and is as yet incomplete.
If you have any comments, suggestions or ideas for new features on this program,
please send e-mail to:
piing@info.vub.ac.be
THANK YOU!