How To Set Up Quality Of Service (QoS) - DrayTek

Trang chủ » Cấu Hình Qos Draytek 2925 » How To Set Up Quality Of Service (QoS) - DrayTek

Có thể bạn quan tâm

  • Products
    • Product Homepage
    • Routers
      • VPN Routers
      • Load Balancing Routers
      • DSL Modem Routers
      • Cellular Routers
      • Fiber Routers
      • All Routers
      • Router Matrix
    • Access Points
      • All Access Points
      • AP Matrix
    • Switches
      • PoE Switches
      • All Switches
      • Switch Matrix
    • Software / Tools
      • VigorACS 3
      • VigorConnect
      • Smart VPN Client
      • DrayTek Router APP
      • DrayTek Wireless APP
      • VigorSMS APP
      • All Utilities
    • Accessories
      • All Accessories
  • Solutions
    • Solution Homepage
    • General
      • VPN
      • SSL VPN
      • Cellular 5G
      • VPN Matcher
      • WAN Load-Balancing
      • DrayDDNS
      • Work from Home Solution
    • Security
      • IAM
      • URL/IP Reputation
      • NIS 2 Security Aligned
    • Wireless
      • Assisted WiFi Roaming
      • Hotspot Web Portal
      • Wireless WAN
      • Wireless Solution
    • Switch
      • Switch Stacking
      • OpenFlow VigorSwitch
    • Central Management
      • AP Management (APM)
      • Switch Management (SWM)
  • Support
    • Support Homepage
    • Resources
      • Latest Firmwares
      • Manuals
      • Databook
      • Live Demo
      • Resource Center
    • Learn
      • FAQs
      • Knowledge Base
      • Case Study
    • Services
      • Warranty Info
      • EULA
      • Product Lifecycle
      • Submit a Ticket
  • About
    • About DrayTek
    • Why Vigor Router
    • What is DrayOS 5
    • Authorized Partners
    • Newsroom
    • Awards/Reviews
    • Security Advisory
    • DrayTek SDL
    • GPL Software Notice
    • Contact Us
  • Partners
  • MyVigor
  • Global/EN 台灣/繁中

Knowledge Base  >   LAN  > 

How to set up Quality of Service (QoS)

QoS (Quality of Service) is a network feature that prioritizes traffic to ensure critical applications—such as VoIP and video conferencing—run smoothly. It manages bandwidth and traffic flow so that important data is delivered first, while less critical traffic uses the remaining capacity.

DrayOS DrayOS 5 Linux

DrayTek Vigor Routers support three classes in QoS settings. Traffic not belonging to any of these classes will be categorized as "Other." To configure QoS on Vigor routers, please use the following steps.

Step1: Set the WAN bandwidth.

For Ethernet WAN connections the router cannot determine the actual line speed of the Internet connection if it is lower than the link speed of the connection. Since the QoS algorithm is based on the actual line speed to successfully allocate the appropriate bandwidth and priority for each class, we need to enter the actual line speed in the QoS settings.

1. Go to speedtest.net website on the browser. Click GO to run the speed test.

2. Go to Bandwidth Management >> Quality of Service.

  • Select the WAN interface we want to set the bandwidth.
  • Set Inbound and Outbound speed we tested on speedtest.net.
  • Click OK to save.
Step2: Set the QoS rule.

Network Administrator can use the classification below to set a class rule :

1. Go to Bandwidth Management >> Quality of Service, click Add to create a class rule we would like to configure.

2. Check Enable and set the rule.

Now the rule we set will be shown on Class Rule.

Step3: Set the percentage of each class.

After setting the QoS rule, we have to decide which class will get higher priority by setting the percentage of each class.

1. Enter the percentage of each class.

Now the QoS settings are complete. Network Administrator may click Status to check the bandwidth usage of each Class.

DrayOS5 Vigor Routers provide QoS function, which can classify traffic into four different QoS classes not only by IP address or Port, but also by Application. This makes it easier for network administrators to allocate bandwidth and optimize network performance.

Example: Small Office Environment
  • Single Internet connection (e.g., 100 Mbps)
  • Typical usage includes:
    • VoIP | The Highest Priority
    • Video conferencing (Teams / Zoom) | High Priority
    • Business-Critical Applications (ERP / RDP servers) | Medium Priority
    • General office browsing (Web / Email / FTP) | Low Priority
    • Background traffic (cloud backup, system updates, etc.) | The Lowest Priority
Vigor Router Setup
  1. Verify the Internet Speed QoS may not function correctly if the entered bandwidth is inaccurate. Before enabling QoS, run a speed test (e.g., at speedtest.net) or contact your ISP to confirm the accurate bandwidth.
  2. Configure Upload Bandwidth and Class Allocation Navigate to Configuration / Bandwidth Management / QoS Setup to set the upload bandwidth and allocate bandwidth for each QoS class. Enter the percentage you want to assign to the first three classes; Vigor will automatically allocate the remaining bandwidth to the “Others” class. Please note that the total allocation cannot exceed 100%. The unused bandwidth from the High Priority class can be used by other classes, but when High Priority traffic is present, it takes precedence.
  3. Create IP Object or Service Object for QoS-enabled Services Set up IP objects for the services that require QoS, e.g., Business-Critical Application Servers such as ERP, RDP, or DB servers. Group the IP Objects into an IP Group.
  4. Set up Traffic Shaping Policy Navigate to Configuration / Bandwidth Management / Traffic Shaping Policy, click +Add to create the policy.
    • Create a policy for business-critical application servers by using a Source IP Group as the matching criterion and mapping the traffic to the Medium QoS class.
    • Create a policy for general office browsing traffic by using Service Type as the matching criterion and mapping the traffic to the Low QoS class.
  5. Set up Applications for Video Conferencing Navigate to Configuration / Bandwidth Management / App QoS, select Teams and Zoom, and map the services to the High QoS Class.
  6. Enable First Priority for VoIP VoIP traffic will have the highest priority. When both VoIP traffic and QoS queues have traffic, VoIP traffic is given priority, and the remaining bandwidth is then allocated according to the QoS queues.
  7. Monitor Network Performance After completing the setup, monitor network performance to ensure critical applications like VoIP and video conferencing are receiving the expected priority. Adjust QoS class allocation or traffic policies as needed based on actual usage patterns.

With QoS properly configured, Vigor Routers can help ensure a smoother, more reliable network experience for all users, even when multiple applications compete for bandwidth.

Note:
  1. QoS for LAN Port Download is suitable when all traffic enters and exits through the same LAN port, such as when the port is connected to a switch or centralized client network.
  2. If LAN Port Download is enabled on multiple LAN ports, the behavior is more like bandwidth limiting rather than pure traffic prioritization. Enabling it also limits LAN-to-LAN traffic, affecting internal data transfers.

Vigor3900 support Hardware QoS for one WAN, its performance is better than software QoS; therefore, we strongly recommend to use the Hardware QoS first.

The example below will show how to configure Vigor3900 QoS for the scenario below. Please notice that the weight is not in percentage, the router will regulate the traffic by the proportion of each class.

Class High Medium Normal Low
Usage FTP server HTTP Server Default (for all) Un-defined
Weight 40 30 20 10

1. Go to Bandwidth Management >> Quality of Service >> Hardware QoS to set up the QoS configuration:

  1. Select the WAN interface.
  2. Enable Outgoing QoS, set the Outgoing Bandwidth and its Queue weight.
  3. Enable Incoming QoS, set the Incoming Bandwidth and its Queue weight.(It is suggested to input the real line speed for Bandwidth. If you don't know the actual Internet speed, perform a speed test it by websites like http://www.speedtest.net/.
  4. Click Apply to save.
screenshot of Vigor3900 QoS settings

2. Go to the Bandwidth Management >> QoS Rule, and click Add to set up the rule profile.

screenshot of Vigor3900 QoS settings

3. Configure the QoS rule for HTTP Server:

  1. Enter a Profile name, check Enable, and set Queue Number to Medium.
  2. Select the IP object of the HTTP Server in Local Address.
  3. Select the Service Type object of HTTP Server at Service Type. (Note: To create customized service types, go to Object Setting >> Service Type Object)
screenshot of Vigor3900 QoS settings

4. Repeat step 3 to set the QoS rule for FTP Server.

screenshot of Vigor3900 QoS settings

5. After finishing the settings, go to Bandwidth Management >> Quality of Service >> Hardware QoS to check if the QoS rule is working.

screenshot of Vigor3900 QoS Status

Published On: 2025-12-19

Share

Was this helpful? YES NO

book icon

Knowledge Base

  • Prioritize VoIP Traffic by QoS
  • How to use Bandwidth Limit
  • How to use Session Limit

    Related Articles

  • Prioritize VoIP Traffic by QoS
  • Give a Hostname to a LAN server by LAN DNS
  • Use Multiple LAN Subnets with Tag-Based VLAN
  • How to have more subnets in one LAN profile (for Vigor3900/2960)

Từ khóa » Cấu Hình Qos Draytek 2925