An Express Guide ~ "dummynet" for tweaking network latencies & bandwidth
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It's an Express Guide to "dummynet" for testing Web/Network Applications in real-use-case scenario ~~~~~ it can allow you to tweak Network Latencies and bandwidth to any value and test the application in those circumstances
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An Express Guide ~ "dummynet" for tweaking network latencies & bandwidth
- 1. Express-Guide ~to~ Testing Web/Network Application With DummyNet Tweaking Network Latency & Bandwidth by, ABK ~ http://www.twitter.com/aBionic ::Task Detail:: Any service allowing to tweak Network Latency as per desire for testing Application Performance at different network latency scenarios. ::Background:: Normally, the difference which comes in Development and Deployment environment of Web Applications is of bandwidth and latency. To test the applications in actual scenario, one needs to tweak the latency as per deployment scene and then use it. There are few paid VE Technology based services like ‘Shunra’ for this. But we required a free, open-source application, if possible for windows. DummyNet, it’s an old Italian university project started for BSD systems, recently ported for Windows also. It helps in reducing latency of NIC to desired level. ::Execution Method:: Install NDIS Driver ◦ Open the configuration panel for the network card in use {right click on the sys-tray icon, or go to 'Control Panel' > 'Network' to select} ◦ Click on 'Properties' > 'Install' > 'Service' > 'Add' ◦ Click on 'Driver Disk' and select 'netipfw.inf' in the folder it has been extracted to. ◦ Select 'ipfw+dummynet' which should be the only service visible. ◦ Click 'Accept' on the warnings for the installation of an unknown driver. Create a BAT-File for your Application to be run under test bandwidth & latency with following content
- 2. ◦ -------------------------------------- @echo on @set CYGWIN=nodosfilewarning @ipfw -q flush @ipfw -q pipe flush @echo ################# @echo ## Setting up ## @echo ################# ipfw pipe 3 config delay 1000ms bw 500Kbit/s mask all ipfw add pipe 3 ip from any to any ipfw pipe show your_command_running_your_app pause @echo ################# @echo ## Cleaning up ## @echo ################# ipfw -q flush ipfw -q pipe flush pause -------------------------------------- ◦ Here, 1000ms is latency set and can be changed to desired value 500 Kbps is bandwidth set and can be changed to desired value 'delay x' and 'bw x'; both can be used separately also as per need either place a command running your application to be tested in place of 'your_command_running_your_app'; or simple remove that line and when the command gets paused at the first pause, run your application manually. ::Tools/Technology Used:: DummyNet: http://info.iet.unipi.it/~luigi/dummynet/ ::Inference:: Different latency settings disturbs only certain network applications, not all of them. If a Web Application is supposed to run on variable latency system, say for now on cloud. Then it needs to be rigorously tested at different latency settings.
- 3. ::Troubleshooting/Updates:: Requirement: to test if it gets installed properly as a network services Solution: it has a testme.bat file showing different tests, just run it and check stats