Network tools that simulate slow network connection

Question

I would like to visually evaluate web pages response time for several Internet connections types  DSL  Cable  T1  dial-up etc   while my browser and web server are on the same LAN or even on the same machine  Are there any simple network tools or browser plug-ins that slow down network bandwidth to simulate different real-world connection scenarios    I appreciate any input on that

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Try Microsoft s NEWT  it worked perfect for me  It supplies customized latency  packet drop techniques and more     http   blog mrpol nl 2010 01 14 network-emulator-toolkit   Update 1   Here is a good video tutorial for NEWT - Network Emulator For Windows Toolkit Tutorial  Credits to Jimmery

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If you use Apache  you can use mod bandwith   See here for configuration parameters

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A simple mac GUI program is   https   www macupdate com app mac 28072 entonnoir  which can limit the speed

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In case you need to simulate network connection quality when developing for Windows Phone  you might give a try to a Visual Studio built-in tool called Simulation Dashboard  more details here http   msdn microsoft com en-us library windowsphone develop jj206952 v vs 105  aspx       You can use the Simulation Dashboard in Visual Studio to test your app   for these connection problems  and to help prevent users from   encountering scenarios like the following          High-resolution music or videos stutter or freeze while streaming  or take a long time to download over a low-bandwidth connection    Calls to a web service fail with a timeout    The app crashes when no network is available    Data transfer does not resume when the network connection is lost and then restored    The user   s battery is drained by a streaming app that uses the network inefficiently    Mapping the user   s route is interrupted in a navigation app                    In Visual Studio  on the Tools menu  open Simulation Dashboard  Find   the network simulation section of the dashboard and check the Enable   Network Simulation check box

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I love Charles   The free version works fine for me   Throttling  rerwiting  breakpoints are all awesome features

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DummyNet  Try this FreeBSD based VMWare image  It also has an excellent how-to  purely free and stands up in 20 minutes   Update  DummyNet also supports Linux  OSX and Windows by now

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On Linux  see netem  the kernel already contains support for traffic shaping  and can simulate high latency  low bandwidth  packet losses  and all sort of other adverse conditions  even on a loopback device  so you don t need a real  physical network to test across

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I am resurrecting this thread because I had the same need recently  Amazingly  I discovered that Fiddler can be used to do that by customizing the rules and adding this line oSession  quot response-trickle-delay quot      quot 150 quot   in the section OnBeforeResponse  Fiddler is really amazing

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Mac OS X has now an integrated tool able to simulate slow and bad networks   http   9to5mac com 2011 08 10 new-in-os-x-lion-network-link-conditioner-utility-lets-you-simulate-internet-and-bandwidth-conditions

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My work uses this tool  and it seems quite good  http   www dallaway com sloppy   Best of luck

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You can also try WANem which is an open source Wide Area Network emulator  You can download the image  ISO  Knoppix live CD  or VMWare virtual appliances

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For Linux or OSX  you can use ipfw   From Quora  http   www quora com What-is-the-best-tool-to-simulate-a-slow-internet-connection-on-a-Mac   Essentially using a firewall to throttle all network data      Define a rule that uses a pipe to reroute all traffic from any source   address to any destination address  execute the following command  as   root  or using sudo          ipfw add pipe 1 all from any to any      To configure this rule to limit bandwidth to 300Kbit s and impose   200ms of latency each way         ipfw pipe 1 config bw 300Kbit s delay 200ms      To remove all rules and recover your original network connection         ipfw flush

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try Traffic Shaper XP you can easily limit speed of IE or other browser with this App and its also freeware

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I ve successfully used TMnetSim  bottom of the page  under    Other Tools    - the link says something like    ZIP  TMnetSim Network Simulator version 2 4 32-bit  600KB      It s not just for websites - you can slow connections to any TCP port  I was using it to simulate a slow SQL Server  port 1433

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You can use dummynet ofcourse  There is extension of dummynet called KauNet  which can provide even more precise control of network conditions  It can drop delay re-order specific packets  that way you can perform more in-depth analysis of dropping key packets like TCP handshake to see how your web pages digest it   It also works in time domain  Usually most the emulators are tuned to work in data domain  In time domain you can specify from what time to what time you can alter the network conditions

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If you d like a hardware solution  Netgear has a series of cheap   50 or so  switches that do bandwidth limiting  Netgear Prosafe GS105E and similar switches are worth investigating

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