I am new to GNS3 and Cisco's Packet Tracer. Besides using GNS3 to simulate complex networks, practice using it for the CCNA exam, and using Dynamips emulation software to simulate Cisco IOS, how is it used in the real world by big companies and corporations? Thanks.
It can also be used for documentation of the networks topology,Top Level Structure, IP address distribution and much more.
It' used for testing complex network configuration like firewall rules or SDN configuration.
You can use it to train on the firewall and servers and connect it to vmware, and also create large projects on the GNS3 and put it in the CV if you haven't experience
It can also be used to test how a network will behave by installing actual Operating system images and a sniffer. Basically it can be used to mimic the actual scenario with the proper resources.
Related
I'm currently building a network monitoring system that will notify me if any interface errors or network issues. after building it we would like to be able to test if it works before implementing it to our network, so need a way of simulating network interface errors on a switch or networking device?
I was thinking about cutting ethernet cables or terminating them wrong, but ideally I need soemthing that can create loads of different types of interface errors
any help would be much appreciated
Sean
You could download Nagios which is a powerful, enterprise-class host, service, application, and network monitoring program. Designed to be fast, flexible, and rock-solid stable. Nagios runs on *NIX hosts and can monitor Windows, Linux/Unix/BSD, Netware, and network devices.
you can download other network monitoring systems from sourceforge they have many different network tools written in different languages most of them are open source. you can take notes of their
design and maybe add to the application you building.
if you want to test your application the best thing to do is to tested on real environment, I believe their might be one or two Virtual Lab.
But Ideally I would tested on real interfaces
One of the ways to simulate network failures would be to dynamically change the firewall settings. You can make packets drop, hosts, disappear, etc. This doesn't require any physical damage to anything :)
Here's a link to my network diagram http://i48.tinypic.com/dcev0y.png
I am trying to learn on my own how to setup networks, and on the hybrid network parts I am confused, how does one calculate the amount of minimum datalink needed for a situation like the picture linked above.
English is not my primary language so it is hard for me to search for the proper keywords. Any help is kindly appreciated.
If possible to do so it would be useful to ask the network provider how much bandwidth was available on each route and how much was currently being used.
If there is a network administrator in your organisation you should speak with them first.
This would be the easiest way to aquire an understanding the network topology in the diagram. But you would need to sensitive to the fact network administrators are typically very busy and under pressure so bear that in mind if you are asking for their time.
If you need to figure this out yourself you need to research and learn about basic network monitoring tools
Here are a list of concepts and tools that you should research and understand.
ports ping, traceroute, nslookup and telnet
You will likely need to research TCP/IP, network addresses and subnetting
In addition you will need to learn how about network interfaces controllers, multi-homing IP addresses, public and private facing IP addresses.
I am sorry if my question is obvious, but i need the expert suggestion/views, i want to test my Client/Server game for which currently, i am using localhost same machine for both Client and Server.
that's why i not getting any fluctuation in data and measure idea of performance, and in other parameters, what i wanted to ask to have a real world scenario:
if i create a little network with two computers or
if check that on LAN on which i am or
ARE THESE THREE CASES (localhost included) ARE EQUIVALENT? or
I really need to test that on different LANs to have reliable testing data and realistic data,
How these different network setups will influence the testing process?
Can somebody please suggest, which could be the ideal way or enough for testing?
which above setup will give me more up and downs in number with LEAST setup/implementing efforts.
Note: The game is suppose to play on the LAN but it is capable of more.
Thanks,
Jibbylala
P.S: i m newbie in network stuff so if u used the wrong terms, vocabulary pardon me
emphasized text
You will want to test your application under different situations. For example, test it using a small LAN where you only have one switch between the two computers. That will ensure that you can, in fact, connect and play over a simple LAN. Then, test different LAN connections such as a slow link (turn a network card down to 10 Mbps), on a wireless LAN, and if possible even a larger or corporate-type LAN. The more testing you can do about different situations, the better. Testing on just your localhost will not be enough.
I'm working as a student-intern in a govt organization to complete my major-project at college.
My task is to simulate a dynamic-routing protocol for ad-hoc networks. As I've good programming experience in C++ thus I've chosen OMNET++ network simulator.
It was easy to adapt to the working environment and I could play around with the samples provide in OMNET IDE.
Problem Statement:
Now, I need to start working on my task i.e. [ http://www.mediafire.com/?s5ajo8gavhcf6sr ] pls have a look at the paper.
Could someone please give me a few general instructions on building an adhoc network model in omnet and then apply a routing protocol to it.
I would really appreciate if you could just read the abstract of that paper and provide me deeper insights if possible.
Unfortunately your uploaded file is deleted.
So I would suggest to use the INETMANET framework for simulating adhoc network.
There are Manet routing protocols like AODV
You have there Wifi b,g and also 802.15.4 link layers
And there are modules for the whole TCP/IP stack.
Hi Guys I'm debugging some CS program and to view the performance of the application in slow internet I tried many different ways. However the best would be the Server and the client be in the same PC ---- my debugging environments for both the server side and the client is setup in one PC.
So I'm wondering is there anyway to limit the speed? I'm using TCP but I don't know too much in-depth knowledge of it.
Thank you
There are two important factors regarding a "slow" internet connection that you need to test out since they have different implications for your application: bandwidth and latency.
If you provide some more details about what os you are running your tests on, it would be easier to recommend a way to limit the network performance.
On a related side note, it's generally a bad idea to performance test any kind of networking using the loopback device on your machine, since many aspects of this will perform very different than the regular network device on your machine.
You mention in the comments this needs to be done on windows, while the Network Emulators I know of (e.g. netem, TCN, other variants) all require Linux. So one thing you could do is create a virtual machine (VirtualBox is fine, I did similar things with it), install linux on it, configure 2 network interfaces, emulate the slow/long/lossy/jittery network between them, and route the test traffic through it from windows.
Finally I found this does what I need.
http://www.nirsoft.net/utils/socket_sniffer.html
Captures Windows Socket traffic, no matter it's local or not.