Setting The Qos Timer Control - 3Com corebuilder 3500 Implementation Manual

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Setting the QoS

Timer Control

This next example illustrates how TCP one-way-filtering can be effective.

Figure 85 shows the same situation, but with TCP drop control enabled to

filter only those packets with the SYN=1 and ACK=0 signature.

Figure 85 QoS Control Action (Drop Control Enabled)

QoS Classifier:

Destination IP:

QoS Control Action:

(SYN=1, ACK=0)

In this example, any attempt by a client on an End User network to

establish a TCP connection to a server on the Admin network still fails,

but it is now possible for clients on the Admin network to establish TCP

connections to servers on any network without restriction.

The QoS Timer option lets you configure a QoS session to take effect

during a predefined time period by setting the start and end times for the

specific control. Setting the start and end times is similar to using a VCR

to record programs.

The default setting for the timer control is no (no timer control). QoS

controlled classifiers are in effect all the time when timer control is not

Starting and ending days use the following syntax:

For example, to enter a date of May 20 you would enter: 05–20

Starting and ending times use the following syntax:

For example, to enter a time of 10 o'clock in the morning you would

enter: 10:00

QoS Controls