我已经成功地使用TMnetSim(页面底部，在“其他工具”下-链接显示类似于“ZIP: TMnetSim网络模拟器2.4 32位(600KB)”

它不仅仅适用于网站——你可以减慢任何TCP端口的连接。我用它来模拟一个缓慢的SQL Server(端口1433)。

如果你使用Apache，你可以使用mod_bandwith。

请参阅这里的配置参数。

在Linux上，请参阅netem:内核已经包含了对流量整形的支持，并且可以模拟高延迟、低带宽、数据包丢失和所有其他不利条件，甚至在环回设备上(因此您不需要一个真实的物理网络进行测试)。

你也可以尝试WANem，这是一个开源的广域网模拟器。您可以下载映像(ISO、Knoppix live CD)或VMWare虚拟设备。

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.

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.