The processing stage takes place after classification and queueing of a data stream.
As network packets are inspected and placed into their appropriate queues, the engine
services each queue and applies the pre-configured processing methods.
Processing is determined by the list of rules configured by the administrator.
Each rule is assigned a collection of processing directives which are split into two groups:
Processing and Advanced Processing.
Enabled - Enables or disables the rule. When set to disabled
the classification, queueing and processing directives for the rule are
ignored by the traffic shaping engine. Disabling a rule is useful for
keeping the rule information stored within the server while preventing
it from being used.
Speed Limit - Sets the maximum transfer rate for the rule.
The speed limit restricts flow rate for the rule by storing stream
data in a queue. The stream is delayed until its flow rate falls
below the specified value. Note that this value is expressed in bytes
per second (B/s) as opposed to bits per second (b/s).
Priority Level - Assigns a quality of service to the to
the stream. Higher priority levels give the rule a speed boost by
allowing the queue to be serviced before other queues with a lower
priority. Assigning a lower priority to a rule forces its stream
data to be queued until all other rules have finished processing.
The default priority level is 5 which includes traffic that is not
covered by any rule.
Advanced Processing Methods
Rule Order - As each packet arrives at the server it is compared
against the list of rules to find a match. In some cases the packet will match
two or more rules causing the server to choose which one it will apply to
the packet. The rule order field assigns the processing order for each rule
in cases where the order is ambiguous. A lower value indicates that the
rule should be checked before all others and a high value is used for
rules that should be scanned last.
Prioritize Acknowledgement Packets - Allows TCP acknowledgements
to be sent before normal stream data. This prevents TCP downloads
from slowing down when the uplink is congested or is sending at the maximum
rate for the internet line. Acknowledgement packets are small (less than
64 bytes) which allows this feature to function with minimal impact on
the overall bandwidth usage.