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Network Capacity Planning

Network Capacity Planning is an aspect of a networked computer system that many IT manager/Network manager forgot to do. Especially for IT managers in a growing company, there are many cases where they got the shocking surprise when their current network infrastructure (seems) suddenly just overwhelmed by the load imposed by its users.

In a WAN (Wide Area Network) environment especially, if a network application will be deployed, it is advised that the company first assess its possible impact on the WAN resources. Because most WAN links has only small bandwidth, even an application that runs fine in a 10 Mbps is still possible to bog down the WAN links when deployed without tested first, making it unusable.

NUS (Network Utility Suite) is a software suite which contains 3 modules, based on client/server architecture. It contains Network Benchmarking, Network Monitoring, and Network Application Simulator modules. This dissertation concerns itself only with the last module, Network Application Simulator, in relation to the interest to network capacity planning.

Each of these modules are done by different people, and presented as a separate project. In the end however, it is intended to merge all of those modules to form a single software suite, called NUS.

NUS's Network Application Simulator is designed to be able to perform robust simulation on the real network itself, if desired, outside office hours for example. It will also be able to perform it in an isolated environment, in a Testlab for example. The following lists its features:

• Ability to perform simulation on the real network, by simulating the specific application tasks over network between the server and client.
• Ability to test the whole subnet of the WAN (more realistic result, but must be done off-hours to avoid impact to working users), or do the test just in an isolated network environment (less realistic, but can be done anytime) between as little as 2 computers.
• Produce statistical report to the user
• Easy-to-use user interface

The ability to simulate an application on the network could be realised with the aid of a spesialised scripting language (NetSim) that will simulate the behaviour of that particular application. So basically we will have a mini interpreter in this software to interpret the script, translate it into a form understandable by the computer, and run it. Before we can create the script, we need to capture the application's traffic first by using any packet capture software; such as LANalyzer, Microsoft's SMS, or some other tools available in UNIX. Then based on the captured information, we can create the script.