如果你在为Windows Phone开发时需要模拟网络连接质量，你可以尝试一下Visual Studio内置的名为模拟仪表板的工具(更多详细信息请访问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.

Mac OS X现在有一个集成的工具，可以模拟缓慢和糟糕的网络:http://9to5mac.com/2011/08/10/new-in-os-x-lion-network-link-conditioner-utility-lets-you-simulate-internet-and-bandwidth-conditions/

如果你想要一个硬件解决方案，Netgear有一系列便宜的(50美元左右)交换机来限制带宽。Netgear Prosafe GS105E和类似的交换机值得研究。

我爱查尔斯。

免费版对我来说很好。

节流、重写、断点都是很棒的功能。

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.

我的作品使用了这个工具，看起来还不错: http://www.dallaway.com/sloppy/

祝你好运。