Windows Core Networking

Windows Core Networking APIs and technologies such as Winsock, TCP/IP stack, WFP, IPsec, IPv6, WSK, WinINet, Http.sys, WinHttp, QoS, and System.Net

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  • Blog Post: The Case of Vista Multimedia Playback and Network Throughput

    Mark Russinovich has a great post today on the what and how of the network/multimedia vista issue that people have recently been talking about. Amusingly enough a couple people on /. more or less figured it out, but are only modded 3 and lower. Go Figure. -- Ari
  • Blog Post: Winsock SO_EXCLUSIVEADDRUSE on Vista

    I've been asked a couple times about the socket option SO_EXCLUSIVEADDRUSE on Vista and especially how it relates to dual stack sockets. The following doc link describes the basic idea of this socket option: http://msdn2.microsoft.com/en-us/library/ms740621.aspx However, it hasn't been updated...
  • Blog Post: The Importance of 5GHz Operation for Video

    Recently, I read a great article on ZDNet that discusses the challenges IEEE 802.11n faces with 2.4GHz operation. The article is appropriately titled The Consequences of Abandoning the 5GHz Frontier , and discusses some history, backward compatibility, and interference. The important takeaway from this...
  • Blog Post: Wireless Routers That Rock: First Works With Vista Router

    Congratulations to D-Link (powered by Ubicom ) for being the first ever to acheive a Windows Vista logo for the DIR-655 wireless router. While Buffalo acheived the premium "Certified for Windows Vista" logo , D-Link was first to meet the baseline "Works with Windows Vista" requirements (months ago)....
  • Blog Post: Wireless Routers That Rock: First Certified For Vista Router

    Congratulations to Buffalo for being the first to acheive a Certified for Windows Vista logo for their dual-band WZR-AG300NH wireless router. In short, this device passed over eight hours worth of rigerous testing designed to ensure a fantastic experience of Windows Vista scenarios; including HD...
  • Blog Post: Windows Vista Networking Goodies, Part 2: Device & Service Discovery

    In my first post of this series, I talked about Windows Connect Now (WCN) and how easy it is in Windows Vista to discover, configure, and securely connect devices to a wireless network. In this post, I’ll talk about how to discover PCs, devices, and services that are available on the network. In Windows...
  • Blog Post: Windows Vista Networking Goodies, Part 1: Windows Connect Now

    In addition to a completely re-written core networking stack, Windows Vista makes networking a significantly easier proposition for home, small business, and enterprise users. In this multi-part series, I’ll describe some new features which greatly simplify the experience of connecting to and configuring...
  • Blog Post: Winsock Header Weirdness

    There are two main Winsock headers used depending on which version your application needs. There is winsock.h for Winsock v1.x and winsock2.h for Winsock v2.x and they are mutually exclusive. That is, if you include both header files you will see a lot of compilation errors. As you may know, windows...
  • Blog Post: Our Mike Flasko and Anthony Jones on Channel 9

    There is a new video up on channel9 talking about Coding to support IPv6. Go check it out! -- Ari Pernick
  • Blog Post: LLTD is Available for Non-Windows Platforms

    Exciting news; the Windows Rally Development Kit was publicly released today on the Windows Rally technologies website! This porting kit is royalty free and provides full source code for an embedded Linux (yes, you read that correctly) reference implementation. Although Linux was used as a reference...
  • Blog Post: Xbox 360 Fall Update Includes LLTD

    There has been a lot of buzz about the recent fall update for the Xbox 360; however, an important new feature which has not been mentioned is support for the Link Layer Topology Discovery ( LLTD ) protocol. In its basic form, LLTD allows a Windows Vista PC to accurately map the topology of your home...
  • Blog Post: WSAPoll, A new Winsock API to simplify porting poll() applications to Winsock.

    Hello, my name is Chad Carlin. I'm a software developer on the Winsock Test Team. Among the many improvements to the Winsock API shipping in Vista is the new WSAPoll function. Its primary purpose is to simplify the porting of a sockets application that currently uses poll() by providing an identical...
  • Blog Post: Creating IP Agnostic Applications - Part 2 (Dual Mode Sockets)

    In a previous post I wrote about how on Windows Vista and Windows Server "Longhorn," IPv6 is installed and enabled by default and that when both IPv4 and IPv6 are enabled, the TCP/IP stack prefers to use IPv6 over IPv4. With the growth of IPv6, applications must now work seamlessly over both protocols...
  • Blog Post: TDI Client to Winsock Kernel (WSK) Porting Survey

    As you know per previous posts on this blog , Winsock Kernel, a new transport-independent kernel mode Network Programming Interface (NPI), is available on Windows Vista and Windows Server Longhorn platforms. On Windows Vista & Windows Server Longhorn, TDI is still supported for compatibility reasons;...
  • Blog Post: How to find consumer network gear that rocks

    Over the past few years, we've seen consumer networking products get really cheap. While cheap in a currency sense is great, we're unfortunately left experiencing the same of product quality (usually while grimacing at the "getting started" manual). Consumer networking gear has been on a race to the...
  • Blog Post: From WinHEC to Black Hat USA 2006

    It’s been several weeks now since WinHEC, and we’ve been hard at work on RC1 work for the NetIO networking stack in Windows Vista and Windows Server Code-Name Longhorn. It was really great to meet with so many of the folks who’ve been partnering with us in changing the face of networking! I was at Black...
  • Blog Post: WiFi QoS Support in Windows Vista: WMM Part 4

    Parts 1-3 of this series on WMM provided a bunch of details about how the Windows Vista network stack enables prioritization on WiFi networks, and how to figure out if the access point actually supports this capability. This post describes what behavior you can expect on a WMM capable wireless network...
  • Blog Post: WiFi QoS Support in Windows Vista: WMM Part 3

    In my previous posts about WMM support in Vista, I described how Windows network applications can indicate which priority level they desire for traffic sent, and how Native WiFi (NWF) drivers can identify this traffic to provide appropriate prioritization over the shared wireless segment. It’s important;...
  • Blog Post: Using Policy-Based QoS to Enable and Manage WMM in Enterprise Wireless Deployments

    If your enterprise wireless AP vendor of choice supports WMM (most likely), and the warriors that wander the halls and conference rooms tote laptops with WMM capable NICs (most likely), you should start taking advantage of this capability. Until Windows Vista’s policy-based QoS feature, the challenge...
  • Blog Post: New Public Forum for Windows Network Development Discussions

    We've just launched a new MSDN public forum for Windows Network Development. The first open forum for discussions is QoS/qWAVE; however, myriad others will follow. We highly encourage open discussion on these forums, and we'll be actively monitoring to answer any questions you have. We are working very...
  • Blog Post: WiFi QoS Support in Windows Vista: WMM part 2

    My previous post on WiFi QoS (WMM) discussed the four access classes (BG, BE, VI, and VO) available for traffic differentiation. I also highlighted that packets containing either a layer-2 802.1p tag or layer-3 DSCP mark (i.e. packets associated with a QoS flow) will be added to the correct WMM access...
  • Blog Post: WiFi QoS Support in Windows Vista: WMM

    In Windows Vista, a great deal of effort has gone into making it simple for network applications to take advantage of QoS capable networks. This post focuses on QoS for WiFi networks (both consumer and enterprise) and how the Vista network stack enables differentiated treatment of outgoing traffic. The...
  • Blog Post: The NDIS 6.0 Driver Model

    NDIS 6.0 was introduced to the independent hardware vendor (IHV) and developer community at last year’s WinHEC. It brings the promise of greater performance, improved manageability, reduced complexity for NDIS miniports, and simpler models for writing intermediate and filter drivers. Are you curious...
  • Blog Post: Extend Windows Vista Wireless

    As we worked on the Windows Vista Wireless Stack, extensibility was one of our key design goals. On previous releases, we’ve gotten a lot of feedback from hardware and software developers on how they’d like to be able to extend the wireless experience. With the new stack, we’ve tried to address as much...
  • Blog Post: Providing 802.1x Enforcement for Network Access Protection

    We’re living in a highly connected world, where a large number of diverse devices gain access to the corporate environment using diverse technologies like wireless, wired 802.1x, virtual private networks (VPN), and more. Though this diversity is a great enabler allowing end users to always have up-to...
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