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Frequently Asked Questions
This FAQ is related to the following IP software
testing tools:
The Questions
A. Traffic Generators
A1. About
LanTraffic V2
A2. About IP Traffic -
Test & Measure
B. About
NetDisturb
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1 |
Can I run NetDisturb on a
Windows Vista system and when will there be
a Windows Vista version available? |
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2 |
I have 2 identical NICs on my PC equipped
with NetDisturb, both
plugged in with working Ethernet cables.
When I run the server, it seems OK. When I
run the client after that, and click on OK,
I get the error message saying: ”Connection
with NetDisturb Server can't be
established.”
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3 |
Description of the
NetDisturb
loss-of-connection-problem: when choosing a
delay/jitter law that concerns a
router/simulation with limited bandwidth,
the emulated connection gets interrupted
after a random amount of time, likely 2 to
15 minutes. The NIC that connects to the LAN
ceases to output packets. We have
intelligent switches that shutdown a port
when more than 100 broadcasts are received
on a port. We are using PCI-Raiser card. |
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4 |
After we have connected one device on each
of the ports on our NetDisturb
machine, that traffic is not passing between
them, even when the default 'other IP flows'
filter is activated. We are in the belief
that this should pass all traffic with no
impairments. It may be worth noting that we
are using VLAN trunk ports to connect these
devices, would this have an effect on the
behaviour? |
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5 |
I just installed NetDisturb
version 4.6 and, I get a message “Embedded
Lan Card can’t be used by NetDisturb
since it has the TCP/IP stack activated. All
NICs that you want to use with
NetDisturb must have all protocols
stacks unchecked”. How do I do that on
Windows XP? |
C. About the
license protection scheme (Site Code / Site Key)
for trial or permanent licenses
The Answers
A. Traffic Generators
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1 |
What is the difference
between IP Traffic - Test & Measure
and LanTraffic V2 software
as they seem to be quite similar? |
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They are not!
IP Traffic - Test & Measure
is a traffic generator and should be used
when you want to calculate the packet loss
or the transit delay. It includes features
in the internal generator to replay the
captured traffic. The Traffic Observer of
IP Traffic - Test & Measure
gives you information on the IP level
throughput. This IP Level analysis is only
available with IP Traffic - Test &
Measure software.
LanTraffic V2 should be
used when you want a better traffic
throughput and don’t need the IP level
statistics. |
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2 |
What is the minimum
packet interval supported by the current
versions of IP Traffic - Test &
Measure and LanTraffic V2?
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- IP Traffic - Test & Measure
and LanTraffic V2
allows you to get an inter-packet delay less
than 1 millisecond. By specifying 0 as inter
packet value, the internal packet generator
send the packets as faster as possible.
Linked to the performances of your target
computer (physical architecture, CPU power,
ram size...) you may able to send tens of
thousands of packets per second.
- IP Traffic - Test & Measure
and LanTraffic V2 can
calculate for you the best inter-packet
delay when you specify the number of packets
per second to send or when you fix a
throughput limitation.
For example, if you specify 3,000 packets
per second,
LanTraffic V2 will calculate
the number of packets per millisecond to
send. Then at the end of each transmitted
packet, it will check if and how long it
should wait before sending other packets.
LanTraffic V2 has a
built in adjustment control and a
millisecond accuracy calculation: You may
send more than 3 packets per millisecond. In
this case,
LanTraffic V2 is going to
wait a little bit to balance the amount of
packets sent in advance. For instance when
your system is able to send 10 packets per
millisecond,
LanTraffic V2 is going to
wait 2 milliseconds before sending other
packets. |
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3 |
What is the throughput
difference between IP Traffic - Test
& Measure and LanTraffic V2? |
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The IP Traffic - Test & Measure
and LanTraffic V2 software
are both IP Traffic Generator. They are able
to generate a high traffic throughput.
The main difference is that IP
Traffic - Test & Measure may also
capture the traffic while generating and
calculate the statistics displayed in the
Traffic Observer tab that LanTraffic
V2 doesn’t calculate: when
activated, these operations will impact the
traffic throughput of IP Traffic -
Test & Measure. To get the same
high level of traffic throughput with both
products, you should disable the capture and
the Traffic Observer statistics from
IP Traffic - Test & Measure by
selecting the “Configuration/Disable the
“Traffic observer” tab to increase
performance” option. |
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4 |
I am looking for IP
Traffic Generator that can set a ToS marking
(i.e. layer 3 Quality of service marking).
Can your product do this? |
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Yes, both IP Traffic - Test &
Measure and LanTraffic V2
allow you to set the quality of service
marking. With IPv4, you define the DSCP
value that fills the IP header field named
Type Of Service (TOS).
With IPv6, the DSCP value is not available.
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A1. About
LanTraffic V2
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1 |
I installed LanTraffic V2
on my PC to generate any IP traffic to
another PC in the network, this lab is to
saturate the 2Mbps bandwidth assigned to
these PC’s. I can’t get it working. I
receive some “connection drop” messages,
Could you please help? |
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There are some reasons of connection
failure with LanTraffic V2.
Assuming there is no error in the IP
addresses i.e. PC#1 and PC#2 uses the same
subnet or a Router/Nat translates addresses,
the most common reasons are the following:
1) The 'Receiver - Traffic + Statistics' tab
on PC#2 is not started when the 'Sender -
Traffic + Statistics' on PC#1 connections
starts. Start the Receiver on PC#2 before
trying to establish connection with the
PC#1.
2) PC#1 can't reach PC#2. To ensure that
the connectivity is correct, try to
Ping PC#2 from PC#1 to check the link.
3) PC#2 doesn't wait on the same port on
PC#1’s configuration. We suggest you to
start the test with the default
configuration on both PCs. To apply the
default configuration, use the menu File/New
on both sides; start the 'Receiver - Traffic
+ Statistics' on PC#2; then enter the IP
address of PC#2 in one connection in the
'Sender - Parameters' tab of the PC#1. PC#1
is now ready to establish connections with
PC#2.
4) PC#1 or PC#2 or both are running an
antivirus application which prevents from
using the configured port. We suggest
using the ‘Getting Started’ help when you
launch the software to check your
configuration. |
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2 |
I have installed LanTraffic V2
on two laptops connected to a switch. I
setup one connection (one laptop is the
sender and the other one is the receiver).
The physical link is 100mbps. When I run
the test in unitary mode, LanTraffic
V2 reports a throughput of
570kbps. I would expect to see
90-100mbps. Why is this? |
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You get this throughput because it is
related to the default traffic generator
parameters.
Indeed by default, the data size used to
fill the TCP or UDP payload is 1460 bytes
and the inter packet delay (latency between
each packet sent) is 20 milliseconds (0
millisecond with new software versions).
With a null value as inter-packet delay (0
millisecond), LanTraffic V2
generates traffic as fast as possible. Be
careful that all LanTraffic V2
statistics are based on data used to fill
payload for TCP or UDP packets (those
statistics calculations don't integrate the
TCP or UDP headers nor the IP and Ethernet
headers).
The throughput value used to define Ethernet
network is a physical throughput (Ethernet
throughput). |
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A2. About IP Traffic -
Test & Measure
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1 |
I want to use IP Traffic - Test &
Measure to generate IP traffic from
PC connected to media converter (copper Ethernet
to fiber Ethernet) and then we
put loop back in media converter so the IP
packet will go back to the source PC (with
your product installed). In other word,
there is no target MAC address/IP address
defined. Can I do that with your product? |
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IP Traffic - Test & Measure
is an application running on the top of the
TCP/IP Windows stack.
IP Traffic - Test & Measure
is able to use different networks:
Satellite, ISDN, ATM, Wireless, FTTx...
So it can be used on any network that
supports IP protocol. |
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2 |
Can IP Traffic – Test & Measure
work with only one PC? Or is it necessary to
use two PCs?
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The current version of IP
Traffic - Test & Measure needs two
PCs because the traffic should go out from
the NIC, and it is not the case if you use
only one PC. We are going to detail 2 major
configurations:
- If there are 2 NICs in the PC, you could
expect to send the traffic from NIC1 to
NIC2, and vice-versa. It is possible to do
that but Windows doesn't send the traffic to
the NIC: it loops back the traffic
internally. We cannot change this Windows
procedure.
- It is the same procedure if you use your
own IP address with only one NIC: Windows
loops internally not using the NIC. In both
cases, Windows reacts as if you were using
the 127.0.0.1 IP address. |
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3 |
I’m using a wireless
network. With IP Traffic – Test &
Measure, when I specify the payload
to be less than 6 bytes, it consumes 100%
CPU usage. Do you know what is going wrong? |
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Yes, the 100% CPU usage is 'normal':
because the packet size is small, the
overhead is very large and the PC makes a
lot of interface exchanges to send the data.
We don't know your Wifi architecture but the
Wifi processor may also consume PC CPU to
achieve the job. On the other hand, the
number of packets handled by IP
Traffic – Test & Measure, used to
generate statistics for the Traffic Observer
tab is also quite large, and consumes CPU
too. |
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4 |
Is it possible to modify the parameters file
of IP Traffic – Test & Measure
for the IP generator for one connection and
apply it to all connections (similar to the
IP address and protocol selection). It is a
very tedious job to change it for everything
one by one. |
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A copy/paste mechanism is available to
copy parameters from one connection to
another one.
To do it, click on the “Connection #XX”
label that you want to copy. Then the
“Connection #XX” label is highlighted in
dark blue. Click on the target connection
label where you want to copy the parameters
specified for the “Connection #XX”.
Redo this operation each time you want to
copy parameters from one connection to
another one. |
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5 |
Is it possible to configure and start
multiple IP Traffic – Test & Measure
remotes at the same time? In our testing the
IP Answering will be running on embedded
computers at remote locations and will not
have a keyboard or monitor connected to
them. If we want to change a configuration,
we will need to access them from a Central
Server running the IP Generator of
IP Traffic – Test & Measure. |
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Yes, we propose to use command line
remote control software - such as rexec or
rsh - to start the 'Automation Tool
for IP Traffic' installed on each
remote PC.
A command line service is installed on each
remote. This command line service receives
the command for your Central Server to start
Automation Tool for IP Traffic
with a '-Start' parameter to launch a
scenario and start IP Traffic - Test
& Measure or a '-Stop' parameter to
stop 'IP Traffic - Test & Measure'.
On the Central Server part, you could use a
.bat file to start/stop each remote. There
is a need of an external rsh, because
neither rexec or rsh are available from
Microsoft for Windows XP environment - they
are only available on Windows 2000 Server
versions. |
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6 |
Can I configure the remote IP
Traffic – Test & Measure (in
answering mode) to start automatically after
reset on Windows? |
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From the version 2.3, IP Traffic
- Test & Measure is able start
automatically when Windows is started, via
the standard Start/All Programs/Startup
Windows mechanism.
When starting, IP Traffic - Test &
Measure loads automatically the
latest context file. The point is the 'Start
All Local Processes' or the 'Start Receiving
Traffic' are not started automatically with
the application: there is a need of a User
to push these Start buttons.
We extend the “Automation Tool for IP
Traffic’ to offer such feature – to load a
scenario and to start it. This allows
starting the remote IP Traffic -
Test & Measure, the IP Generator
and/or IP Answering, as soon as Windows has
been started in a User Logon context. |
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7 |
I am using IP Traffic – Test &
Measure on a network which has a
high network delay (from 40ms to 60 ms).
With default configuration, I can’t get a
throughput higher than 18 Mbits per second
with one TCP connection. How can I configure
IP Traffic – Test & Measure
to get the best throughput? |
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The throughput of TCP connections is
handled by some Winsock parameters that can
be configured using the
‘Configuration/Microsoft TCP Stack
Parameters” menu. The TCP Windows size may
be configured per software.
IP Traffic - Test & Measure
allows extending the TCP Windows size by
configuring the SO_RCVBUF and SO_SNDBUF.
With IP Traffic - Test & Measure
release 2.5, the TCP window size may be
sized up to 1 Mbytes while previous versions
were limited to 65 Kbytes. |
B. About
NetDisturb
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1 |
Can I run NetDisturb on a
Windows Vista system and when will there be
a Windows Vista version available? |
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The current version of
NetDisturb doesn't support Windows
Vista: We are actually testing
NetDisturb v4.7 in our labs and
Windows Vista is included in the list of
tests to be done.
The version supporting Windows Vista is
going to be available soon. |
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2 |
I have 2 identical NICs on my PC equipped
with NetDisturb, both
plugged in with working Ethernet cables.
When I run the server, it seems OK. When I
run the client after that, and click on OK,
I get the error message saying: ”Connection
with NetDisturb Server can't be
established.”
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If the
NetDisturb Client
can't access to the NetDisturb
Server, it may be due to a
restriction on the RPC authorization of your
PC.
For example, it is often the case when you
are using Windows XP SP2 with a previous
version of NetDisturb v4.6.
To solve this problem, you have to change
the relevant key in the registry such as:
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
NT\RPC] "RestrictRemoteClients"=dword:00000000.
You can download from ZTI web site the .REG
file that changes this registry entry by
using:
http://www.zti-telecom.com/download/NetDisturb-EnableRPC.reg
Then, copy that file on a temporary location
and double-click on it. Windows will ask you
if you agree to change the registry: select
Yes. Then reboot your PC who’s going to
restart NetDisturb.
Note: since NetDisturb
V4.6, the client dialogs with the server
using the SOAP mechanism in order to prevent
from encountering security restriction
problems. You may also upgrade to version
4.6.
For further information please email us at:
support@zti-telecom.com |
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3 |
Description of the
NetDisturb
loss-of-connection-problem: when choosing a
delay/jitter law that concerns a
router/simulation with limited bandwidth,
the emulated connection gets interrupted
after a random amount of time, likely 2 to
15 minutes. The NIC that connects to the LAN
ceases to output packets. We have
intelligent switches that shutdown a port
when more than 100 broadcasts are received
on a port. We are using PCI-Raiser card. |
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It is not a matter of NetDisturb
nor of your NIC (we recommend 3COM, Intel or
Broadcom NIC but others can be used too).
You may try to replace the PC to make
disappear the problem, because it should be
due to the PCI-Raiser (for example some HP
are using such technology so 1 PCI-slot is
used for 2 LAN-cards). This is of the main
reason of the symptom. |
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4 |
After we have connected one device on each
of the ports on our NetDisturb
machine, that traffic is not passing between
them, even when the default 'other IP flows'
filter is activated. We are in the belief
that this should pass all traffic with no
impairments. It may be worth noting that we
are using VLAN trunk ports to connect these
devices, would this have an effect on the
behaviour? |
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Regarding the VLAN configuration with
NetDisturb, there are some
NICs that should be configured to support
the VLAN forwarding: there should be a
parameter in the NIC driver configuration to
allow the VLAN going through. There are
examples of the configuration parameters for
Broadcom and Intel NICs driver that you can
download at
http://www.zti-telecom.com/download/VLAN-Capture-NIC-configuration.pdf. |
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5 |
I just installed NetDisturb
version 4.6 and, I get a message “Embedded
Lan Card can’t be used by NetDisturb
since it has the TCP/IP stack activated. All
NICs that you want to use with
NetDisturb must have all protocols
stacks unchecked”. How do I do that on
Windows XP? |
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Because NetDisturb is
an Ethernet Bridge, there should be no local
protocol stack able to handle the Ethernet
frames received. When active, these
protocols may conflict with the
NetDisturb impairment. The simplest
way to deactivate these protocols is to
access the Properties for each NIC that
NetDisturb is going to use
and to unselect all protocols (called items)
from the list.
More details can be found in the
NetDisturb User Guide version 4.6 §
3.7.1 page 30. |
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C. About the
license protection scheme (Site Code / Site Key)
for trial or permanent licenses
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1 |
We powered up the machine where we installed
the ZTI Software on and the Site Code changed,
the machine wasn’t connected to our LAN at
the time. It’s the same machine; can you
explain why the Site Code might change?
I had uninstalled your software and, when I
reinstalled it, the site code I had has been
denied. Can you explain why? |
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Every time the software is
installed on a machine the Site Code
changes. This is part of the license
protection security scheme.
To get the Site Key for your license, please
do not hesitate to email at
contact@zti-telecom.com.
Please consider to use the USB Software
Protection Key to avoid the request for a
new Site Key each time you have to reinstall
the software or in case of crash disk. |
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2 |
I plugged off my PC. Now I got a message
with a title: ”Network License” and an
explanation : “The program uses a network
and the maximum number of simultaneous users
has been exceeded ...”. How can I remove the
user that seems to use this software ?
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There is a file with TB2 extension in the installation
directory. This file contains the current
number of users for the software. When you
delete the .TB2 file, you remove all the
users of the software and you set the
license available for a new user of the
software. |
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