Configuration Settings
Rev 4 May.17
67
A.2.4 QoS Priority
QoS policies provide different priorities to various applications and guarantee a
certain level of performance to data flow.
QoS policies are egress based. For example, applying a QoS policy to a WAN
interface is recommended to limit the bandwidth being consumed by video traffic
being viewed remotely. The oMG applies QoS policies to the traffic in the queue
for the WAN link before the traffic is encrypted. Therefore QoS also works for VPN
traffic.
Adding a QoS priority rule gives traffic priority based on the following:
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Destination Port: enter the port number.
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Destination Address: enter the application server IP address.
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Leaving this field blank will give priority to all traffic on this port.
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Source Port: enter the port number.
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Use for applications that do not have a predetermined IP address (e.g.
VoIP)
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Source Address: enter the source IP address.
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Use for applications that do not have a predetermined IP address (e.g.
VoIP)
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Priority: Traffic to the WAN in the specified port and destination IP address
will be given priority based on the priority value specified in integers. The
lowest priority is 0. The higher the number, the higher the priority.
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Maximum Guaranteed Bandwidth: Enter a rate and select the unit of data
transfer rate. The default is No guarantee (i.e. 0).
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The maximum guaranteed bandwidth is used to ensure that higher
priority classes do not deny lower priority classes when the available
bandwidth is less than the sum of the minimum guaranteed bandwidth for
all classes.
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Minimum Allowed Bandwidth: Enter a rate and select the unit of data transfer
rate. The default is Use available.
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The minimum guaranteed bandwidth is used to ensure high priority
classes do not receive a better level of service than for which they have
paid.
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Example:
For a 100mbit connection:
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Client A: MAB = 10mbit, MGB = 0 (no limit)
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Client B: MAB = 10mbit, MGB = 15mbit
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Client C: MAB = 40mbit, MGB = 40mbit
Assuming all clients want to use data, the following is what would be available:
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C: 40mbit
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B: 15mbit
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A: 100 - 40 - 15 = 45mbit
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Fields that are left blank are treated as “wildcards”.
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Enter a rule name for identification purposes.
For applications that do not have a predetermined destination IP address such as
Voice-over-IP, using the Source IP Address and Source Port is supported.