ZyWALL ATP Series User’s Guide
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CHAPTER 23
BWM (Bandwidth
Management)
23.1 Overview
Bandwidth management provides a convenient way to manage the use of various services on the
network. It manages general protocols (for example, HTTP and FTP) and applies traffic prioritization to
enhance the performance of delay-sensitive applications like voice and video.
23.1.1 What You Can Do in this Chapter
Use the BWM screens (see Section 23.2 on page 430) to control bandwidth for services passing through
the Zyxel Device, and to identify the conditions that define the bandwidth control.
23.1.2 What You Need to Know
When you allow a service, you can restrict the bandwidth it uses. It controls TCP and UDP traffic. Use
policy routes to manage other types of traffic (like ICMP).
Note: Bandwidth management in policy routes has priority over TCP and UDP traffic policies.
If you want to use a service, make sure both the security policy allow the service’s packets to go through
the Zyxel Device.
Note: The Zyxel Device checks security policies before it checks bandwidth management
rules for traffic going through the Zyxel Device.
Bandwidth management examines every TCP and UDP connection passing through the Zyxel Device.
Then, you can specify, by port, whether or not the Zyxel Device continues to route the connection.
BWM Type
The Zyxel Device supports three types of bandwidth management: Shared, Per user and Per-Source-IP.
The Shared BWM type is selected by default in a bandwidth management rule. All matched traffic
shares the bandwidth configured in the rule.
If the BWM type is set to Per user in a rule, each user that matches the rule can use up to the configured
bandwidth by his/her own.
Select the Per-Source-IP type when you want to set the maximum bandwidth for traffic from an
individual source IP address.
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