7. QoS Configuration

Overview

Quality of Service (QoS) offers the capability to a network to provide a better service to selected network traffic within TCP/IP networks. The goal of QoS is to provide priority to identified network traffic including dedicated bandwidth, controlled jitter and latency that is required by real time applications while improving quality by reducing packet loss.

The Duolinks SW24 Series Load Balancer provides QoS based on the Type of Service (ToS) header or by using user defined QoS policies.

Once enabled, it will classify outgoing packets based on policies and enable real-time applications to get better response or performance.

QoS Setup

The following configuration page guides you on how to setup QoS.

QoS Setup Page

Settings – QoS Setup.

QoS Feature

· Enable QoS – Users can choose to Enable QoS (Quality of Service). If set to "enable" QoS, the QoS will allow higher priority packets to pass through the device.

· Queuing Method – The methods for managing your queue. "Priority Queuing" is one of the first queuing variations to be widely implemented. This is based on the concept that certain types of traffic can be identified and shuffled to the front of the output queue so that some traffic is always transmitted ahead of other types of traffic.

IP TOS ( Type of Service) Feature

· Process TOS Field – An 8 bits field in the IP packet header designed to contain values indicating how each packet should be handled in the network. If you choose "enable" then it will enable this function to process IP Type of Service field.

· Overwrite policy priority – Choose “yes” to set the priority of TOS field in IP packet overwrite the priority defined in policy configuration.

QoS Policy Configuration

Settings in the QoS policy can assign received packets a higher or a lower priority based on your configuration to pass through the device. You can define policies which classify received packets based on source/destination IP, MAC, port and protocol type. This feature is useful when the WAN link is very busy or congested or when using special applications that need real time services such as Internet phone, video conferencing... etc.

QoS Policy Configuration Page

Settings – Policy Configuration.

Policy Priority

· Policy Name – The name of a policy which is used to classify the received packets based on the following types for your memory.

· Source/Destination Address, Port – Specify a packet based on source/destination address or port. Address has two types: IP address and MAC address. By default, the IP address is 0.0.0.0 for all IP Addresses but the MAC address is 00-00-00-00-00-00 which cannot be used to classify.
Port and Protocol Type define all packets for special applications.

· Protocol Type – This field defines traffic packet type, i.e. IP,TCP and UDP.

· Source Port – This field defines the source ports.

· Destination Port – This field defines the destination ports.

· Priority Queue – This device supports four queues. When a packet meets a policy rule requirement, it will be put into the responding queue. Otherwise, it is assigned the lowest priority to pass through.