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table appears and you are able to select up to ten IP Ports for 
prioritization.
Prioritized port numbers can be in the range 0 - 65535 inclusive. The 
specified ports will be given either normal or high priority depending on 
the value selected in the Priority drop-down list. If the specified port 
numbers are given high priority, all other port numbers will have normal 
priority. Conversely, if the specified port numbers are given normal 
priority, all other port numbers will have high priority. it is therefore 
possible to increase or decrease the priority of the specifified IP Port 
numbers relative to all other traffic.
To quickly populate the Custom QoS TCP/IP table, use the Prioritize 
Traffic drop-down-list. The list contains some useful presets.
Note: Because the use of TCP/IP and UDP/IP is so widespread, this 
method of traffic prioritization is most likely to provide useful 
results.
DSCP
Packets are prioritized using the DSCP (Differentiated Services Code 
Point) value.
The Differentiated Services Code Point (DSCP) is a six bit field that is 
contained within an IP (TCP or UDP) header. Six bits allows the DSCP 
field to take any value in the range 0 - 63 inclusive. When QoS Mode is set 
to DSCP, the DSCP Configuration table appears which allows a priority 
(normal or high) to be set for each of the DSCP values.
You can use the Prioritize Traffic drop-down list to quickly set the values 
in the DSCP Configuration table. Select All Normal Priority to set all 
values to normal priority or select All High Priority to set all values to high 
priority. Use Custom if you want to set each value individually.