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ProSafe VPN Firewall 200 FVX538 Reference Manual
Firewall Protection and Content Filtering 4-23
v1.0, August 2006
To edit the parameters of a service:
1. In the Custom Services Table, click the Edit icon adjacent to the service you want to edit. The
Edit Service screen will display.
2. Modify the parameters you wish to change.
3. Click Reset to cancel the changes and restore the previous settings.
4. Click Apply to confirm your changes. The modified service will display in the Custom
Services Table.
Setting Quality of Service (QoS) Priorities
The Quality of Service (QoS) Priorities setting determines the priority of a service, which in turn,
determines the quality of that service for the traffic passing through the firewall. The user can
change this priority
•On the Services screen in the Custom Services Table for customized services (see Figure 4-
15).
•On the Add LAN WAN Outbound Services screen (see Figure 4-3.)
•On the Add DMZ WAN Outbound Services screen (see Figure 4-5)
The QoS priority definition for a service determines the queue that is used for the traffic passing
through the VPN firewall. A priority is assigned to IP packets using this service. Priorities are
defined by the “Type of Service (ToS) in the Internet Protocol Suite” standards, RFC 1349. A ToS
priority for traffic passing through the VPN firewall is one of the following:
• Normal-Service: No special priority given to the traffic. The IP packets for services with this
priority are marked with a ToS value of 0.
• Minimize-Cost: Used when data has to be transferred over a link that has a lower “cost”. The
IP packets for services with this priority are marked with a ToS value of 1.
• Maximize-Reliability: Used when data needs to travel to the destination over a reliable link
and with little or no retransmission. The IP packets for services with this priority are marked
with a ToS value of 2.
• Maximize-Throughput: Used when the volume of data transferred during an interval is
important even if the latency over the link is high. The IP packets for services with this priority
are marked with a ToS value of 4.
• Minimize-Delay: Used when the time required (latency) for the packet to reach the
destination must be low. The IP packets for services with this priority are marked with a ToS
value of 8.