Windows 7 / Networking

Configuring Advanced QoS Settings

You can also configure advanced QoS settings for computers using Group Policy. Within the Group Policy Object Editor, right-click the Computer Configuration\Windows Settings\Policybased QoS node and then click Advanced QoS Settings. You can use the Advanced QoS Settings dialog box to configure the following settings:

  • Specify The Inbound TCP Throughput Level Most QoS policies relate to outbound traffic that the client computer sends. You can use this setting on the Inbound TCP Traffic tab to configure Windows so that it will attempt to throttle incoming traffic. Although Windows has direct control over the throughput of outbound traffic, it has indirect control only over the rate of incoming traffic. For TCP connections, you can configure a Windows client computer to limit incoming traffic by specifying the maximum size of the TCP receive window. The TCP receive window is the amount of data that a receiver allows a sender to send before having to wait for an acknowledgment. A larger maximum window size means that the sender can send more data at a time, increasing network utilization and throughput. By limiting the maximum size of the TCP receive window, a receiver can indirectly control the incoming throughput for a TCP connection. Level 3 (Maximum Throughput) is for a 16-megabyte (MB) TCP receive window. Level 2 is for a 1-MB TCP receive window. Level 1 is for a 256-kilobyte (KB) TCP receive window. Level 0 is for a 64-KB TCP receive window. Unlike Policy-based QoS settings for outgoing traffic, this setting cannot control the rate of incoming traffic on a per-application, per-address, or per-port basis.
    Note Because UDP traffic is not acknowledged, you cannot throttle UDP traffic from the receiving computer.
  • Control DSCP Marking Requests From Applications DSCP marking adds information to outgoing packets to identify the priority of the packet. If your network infrastructure supports DSCP-differentiated delivery, the infrastructure can use the DSCP value to select a priority for traffic. Use this setting to allow applications to specify their own DSCP values or to ignore application-specified values and only allow QoS policies to specify DSCP values.

For more information about Policy-based QoS, visit the "Quality Of Service" home page at

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In this tutorial:

  1. Configuring Windows Networking
  2. Usability Improvements
  3. Network And Sharing Center
  4. Network Explorer
  5. How Windows Finds Network Resources
  6. How Windows Publishes Network Resources
  7. How Windows Creates the Network Map
  8. Network Map
  9. Set Up A Connection Or Network Wizard
  10. Manageability Improvements
  11. Network Location Types
  12. Policy-Based QoS
  13. Selecting DSCP Values
  14. Planning Traffic Throttling
  15. Configuring QoS Policies
  16. Configuring System-Wide QoS Settings
  17. Configuring Advanced QoS Settings
  18. Testing QoS
  19. Windows Firewall and IPsec
  20. Windows Connect Now in Windows 7
  21. Core Networking Improvements
  22. Networking BranchCache
  23. How Hosted Cache Works
  24. How Distributed Cache Works
  25. Configuring BranchCache
  26. BranchCache Protocols
  27. File Sharing Using SMB
  28. Web Browsing with HTTP (Including HTTPS)
  29. DNSsec
  30. GreenIT
  31. Efficient Networking
  32. What Causes Latency, How to Measure It, and How to Control It
  33. TCP Receive Window Scaling
  34. Scalable Networking
  35. Improved Reliability
  36. IPv6 Support
  37. 802.1X Network Authentication
  38. Server Message Block (SMB) 2.0
  39. Strong Host Model
  40. Wireless Networking
  41. Improved APIs
  42. Network Awareness
  43. Improved Peer Networking
  44. Services Used by Peer-to-Peer Networking
  45. Managing Peer-to-Peer Networking
  46. Peer-to-Peer Name Resolution
  47. EAP Host Architecture
  48. Layered Service Provider (LSP)
  49. Windows Sockets Direct Path for System Area Networks
  50. How to Configure Wireless Settings
  51. Configuring Wireless Settings Manually
  52. Using Group Policy to Configure Wireless Settings
  53. How to Configure TCP/IP
  54. DHCP
  55. Configuring IP Addresses Manually
  56. Command Line and Scripts
  57. How to Connect to AD DS Domains
  58. How to Connect to a Domain When 802.1X Authentication Is Not Enabled
  59. How to Connect to a Domain When 802.1X Authentication Is Enabled