Quick Reference Guide

ProSafe VPN Firewall 200 FVX538 Reference Manual
Firewall Protection and Content Filtering 4-5
v1.0, March 2009
QoS Priority The priority assigned to IP packets of 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 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 must 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.
This setting determines the priority of a service which, in turn, determines the quality
of that service for the traffic passing through the firewall. By default, the priority
shown is that of the selected service. The user can change it accordingly. If the user
does not make a selection (i.e., leaves it as None), then the native priority of the
service will be applied to the policy. See “Setting Quality of Service (QoS) Priorities”
on page 4-27.
NAT IP Specifies whether the source address of the outgoing packets on WAN should be
assigned WAN interface address OR different one.
• NAT single IP is on: The Interface to which the NAT IP belongs to. All the outgoing
packets on WAN will be routed through the specified WAN interface only.
• WAN Interface Address: All the outgoing packets on WAN will be assigned WAN
interface address.
• Single Address: All the outgoing packets on WAN will be assigned the specified IP
address.
Note: This option will be available only when WAN mode is NAT. The IP address
specified should fall under the WAN subnet.
Table 4-2. Outbound Rules (continued)
Item Description