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Chapter 27 Application Patrol
ZyWALL USG 300 User’s Guide
382
Figure 297 LAN to WAN, Outbound 200 kbps, Inbound 500 kbps
27.4.3 Bandwidth Management Priority
The ZyWALL gives bandwidth to higher-priority traffic first, until it reaches its configured
bandwidth rate.
Then lower-priority traffic gets bandwidth.
The ZyWALL uses a fairness-based (round-robin) scheduler to divide bandwidth among
traffic flows with the same priority.
The ZyWALL automatically treats traffic with bandwidth management disabled as priority 7
(the lowest priority).
27.4.4 Maximize Bandwidth Usage
Maximize bandwidth usage allows applications with maximize bandwidth usage enabled to
“borrow” any unused bandwidth on the out-going interface.
After each application gets its configured bandwidth rate, the ZyWALL uses the fairness-
based scheduler to divide any unused bandwidth on the out-going interface amongst
applications that need more bandwidth and have maximize bandwidth usage enabled.
Unused bandwidth is divided equally. Higher priority traffic does not get a larger portion of
the unused bandwidth.
27.4.5 Bandwidth Management Behavior
This section shows how bandwidth management behaves with various settings. For example,
you configure DMZ to WAN policies for FTP servers A and B. Each server tries to send 1000
kbps, but the WAN is set to a maximum outgoing speed of 1000 kbps. You configure policy A
for server A’s traffic and policy B for server B’s traffic.
GE1 GE2
GE3
GE4
GE5
LAN
WAN
DMZ
Inbound: 500 kbps
Outbound: 200 kbps
Outbound: 200 kbps