HP OfficeConnect Firewall Series Manuel d'utilisateur télécharger pdf (Page 89)

OfficeConnect VPN Firewall User’s Manual Chapter 14. Configuring IPSec VPN

12 Configuring Quality of Service

12.1 Overview

Quality of Service (QoS) is the ability to provide different priority to different

applications, users, or data flows, or to guarantee a certain level of performance

to a data flow. For instance, a required bit rate, delay, jitter, packet dropping

probability and/or bit error rate may be guaranteed. Quality of Service (QoS)

guarantees are important if the network capacity is insufficient, especially for

real-time streaming multimedia applications such as voice over IP, online games

and IP-TV.

You may follow these steps to configure the QoS on the OfficeConnect Gigabit

VPN Firewall:

Step 1: Define the maximum bandwidth of WAN interface.

Step 2: Create a QoS Class Object

Step 3: Create a QoS Policy and apply the policy to a specific interface

12.2 Define the Maximum Bandwidth

To define the maximum bandwidth of WAN interface, follow these steps:

1. Click ―Traffic MGMG‖ menu in the main menu and then click

―Interface‖ sub-menu. The existing settings are summarized in the

Interface Settings table. See Figure 12.1.

2. Click on the icon to edit the selected interface.

3. Enter Max. TX to limit the gateway's bandwidth transmission rate.

The purpose is to limit the bandwidth of the WAN device to that of

the weakest outbound link, for instance, the DSL speed provided by

the ISP. This forces OffceConnect Gigabit VPN Firewall to be the

network bottleneck, where sophisticated QoS prioritization can be

performed. If the device's bandwidth is not limited correctly, the

bottleneck will be in an unknown router or modem on the network

path, rendering QoS useless.

4. In the same manner, enter Max. RX to limit the gateway's bandwidth

reception rate to that of the DSL modem.

Figure 12.1 Interface Settings List Table

5. Make the ―Enable QoS‖ check box checked if you want to associate

QoS policy to the selected WAN interface.

6. Make the ―Enable DSCP Queuing‖ check box checked if you want to

create queues for the DiffServ QoS.

7. Make the ―802.1p‖ check box checked if you want to allow 802.1p to

DSCP mapping.

8. Click on the button to save the settings.

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HP OfficeConnect Firewall Series Manuel d'utilisateur Page 89