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Chapter 32 Application Patrol
ZyWALL USG 300 User’s Guide
553
regardless of its priority, server B gets almost no bandwidth with this
configuration.
Finding Out More
• See Section 6.5.18 on page 107 for related information on these screens.
• See Section 7.7 on page 144 for an example of how to set up web surfing
policies with bandwidth restrictions.
• See DSCP Marking and Per-Hop Behavior on page 375 for a description of DSCP
marking.
32.1.3 Application Patrol Bandwidth Management Examples
Bandwidth management is very useful when applications are competing for limited
bandwidth. For example, say you have a WAN zone interface connected to an
ADSL device with a 8 Mbps downstream and 1 Mbps upstream ADSL connection.
The following sections give some simplified examples of using application patrol
policies to manage applications competing for that 1 Mbps of upstream bandwidth.
Here is an overview of what the rules need to accomplish. See the following
sections for more details.
• SIP traffic from VIP users must get through with the least possible delay
regardless of if it is an outgoing call or an incoming call. The VIP users must be
able to make and receive SIP calls no matter which interface they are connected
to.
• HTTP traffic needs to be given priority over FTP traffic.
• FTP traffic from the WAN to the DMZ must be limited so it does not interfere
with SIP and HTTP traffic.
Table 144 Priority and Over Allotment of Bandwidth Effect
POLICY CONFIGURED RATE MAX. B. U. PRIORITY ACTUAL RATE
A 1000 kbps Yes 1 999 kbps
B 1000 kbps Yes 2 1 kbps