QoS Traffic Generator Example Usage

Update: This tool is no longer available on Microsoft Connect and there is no replacement download site.  In my last post, I announced the availability of QoS Traffic Generator on Microsoft Connect. In order to help you understand the usage of this tool, I have provided some examples of what it can do. One of…


QoS Traffic Generator is now available on Connect

Update: This tool is no longer available on Microsoft Connect and there is no replacement download site. I’m posting on behalf of Jim Liu who is a SDET in Windows Core Networking. — Ari The QoS team is pleased to announce the availability of the QoS Traffic Generator on Microsoft Connect. This tool was developed…


QoS in Windows 7

Hello all. My name is Charley. I’m the new QoS program manager for Windows Core Networking. It has been a while since we posted our last article about QoS. We want to assure you that we’re still committed to improving this technology and building new QoS features in Windows. We received many questions and suggestions…

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Throttling, DSCP, and 802.1p with Traffic Control

In his introductory post about the legacy Traffic Control (TC) API, Gabe discussed the host-based model that TC provides. In this post, we will see how Traffic Control APIs can be used to achieve the following for TCP/IPv4 and UDP/IPv4 traffic sent from a host: Throttle (rate-limit) outgoing traffic Add DSCP value in layer-3 (IPv4)…

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Introduction to Windows QoS Traffic Control

Disclaimer: Traffic Control (TC) APIs have been marked as deprecated, and will be phased out (eventually removed) when a suitable replacement API is available. No advancements will be made to these APIs (including adding IPv6 support) in their deprecated state; however, application compatibility will be maintained until their eventual removal. Since the introduction of a…

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WiFi WMM Requirements for Vista Miniport Drivers

A number of partners who author wireless drivers for Vista have asked how they can ensure their WiFi Wireless Multimedia (WMM) implementation is correct, so I thought I’d be explicit about this very important topic. To begin, read the 4-part series WiFi QoS Support in Windows Vista, which describes how Vista internally indicates a WMM…

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Detecting 802.1p Priority Tags: Part 3

Parts 1 and 2 of this series discussed how to determine whether an 802.1p tag was added to traffic, and how to modify the NDIS light-weight-filter (LWF) sample driver source code to accomplish this task. We do know that you’re all very busy and not everyone is a developer, so we’ve added to the package:…

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Detecting 802.1p Priority Tags: Part 2

In Gabe’s last post on detecting 802.1p priority tags, he described at a relatively high-level why it is difficult to detect a priority tag using packet tracing applications, as well as the proper way to determine whether a tag was present in a packet that was sent onto the wire (or air). In this post,…

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Detecting 802.1p Priority Tags

Consider a case where a network application calls Windows QoS APIs to add a layer-2 IEEE 802.1Q UserPriority tag (almost always referred to as 802.1p) to outgoing traffic. Ascertaining whether the tag actually got added to an outgoing packet is not as simple as it seems due to the nature of how the Windows network…

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Windows Rally Demo’d at WinHEC

I noticed that there was a demo of Rally technologies at the WinHEC keynote the other day, so I created a link to part of the keynote with the Rally demo. Enjoy.  — Ari Pernick Media Link.asx

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