Bandwidth Management; Overview; What You Can Do In This Chapter; What You Need To Know - ZyXEL Communications ZYWALL USG 20 Manual

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H A P T E R

28.1 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.

28.1.1 What You Can Do in this Chapter

Use the BWM screens (see
services passing through the ZyWALL, and it identifies the conditions that refine
this.

28.1.2 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 policy routes to
manage the bandwidth of TCP and UDP traffic.
If you want to use a service, make sure both the firewall allow the service's
packets to go through the ZyWALL.
Note: The ZyWALL checks firewall rules before it checks bandwidth managementl
rules for traffic going through the ZyWALL.
Bandwidth management examines every TCP and UDP connection passing through
the ZyWALL. Then, you can specify, by port, whether or not the ZyWALL continues
to route the connection.
DiffServ and DSCP Marking
QoS is used to prioritize source-to-destination traffic flows. All packets in the same
flow are given the same priority. CoS (class of service) is a way of managing traffic
ZyWALL USG 20/20W User's Guide

Bandwidth Management

Section 28.2 on page
28
461) to control bandwidth for
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