Netgear FVS338 참조 가이드

Firewall Protection and Content Filtering

4-19

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. 

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 Customer Services Table for customized services (see 

•

On  the  LAN WAN Outbound Services screen (see 

).

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.