DGFV338 ProSafe Wireless ADSL Modem VPN Firewall Router Reference Manual
Quality of Service (QoS) Priorities
This 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 for Outbound Services only.
Outbound Rules Add Screen
QoS Priority
Figure 4-14
The QoS priority definition for a service determines the IP packets queue for outbound traffic passing through the ProSafe DGFV338 for this service. The priorities are defined by “Type of Service (TOS) in the Internet Protocol Suite” standards, RFC 1349. The router marks the Type Of Service (TOS) field as defined below:
•Normal-Service: No special priority is given to the traffic. The IP packets for services with this priority are marked with a ToS value of 0.
•Minimize-Cost: Used when the data must be transferred over a link that has a low transmission cost. The IP packets for this service priority are marked with a ToS value of 1.
•Maximize-Reliability: Used when data needs to travel to the destination over a reliable link with little or no retransmission. The IP packets for this service priority are marked with a ToS value of 2.
•Maximize-Throughput: Used when the volume of data transferred during an interval is important even though it may have a high link latency. The IP packets for this service priority are marked with a ToS value of 4.
Security and Firewall Protection | 4-19 |
v1.0, April 2007