Application Patrol Bandwidth Management Examples; Table 136 Priority And Over Allotment Of Bandwidth Effect - ZyXEL Communications ZyWALL USG 300 User Manual

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Chapter 28 Application Patrol

Priority and Over Allotment of Bandwidth Effect

Server A has a configured rate that equals the total amount of available bandwidth and a

higher priority. You should regard extreme over allotment of traffic with different priorities

(as shown here) as a configuration error. Even though the ZyWALL still attempts to let all

traffic get through and not be lost, regardless of its priority, server B gets almost no bandwidth

with this configuration.

Finding Out More

Section 5.4.13 on page 115

Section 6.4 on page 132

bandwidth restrictions.

28.1.3 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

• 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.

• FTP traffic from the LAN to the DMZ can use more bandwidth since the interfaces

support up to 1 Gbps connections, but it must be the lowest priority and limited so it does

not interfere with SIP and HTTP traffic.

CONFIGURED RATE MAX. B. U. PRIORITY

for an example of how to set up web surfing policies with

for related information on these screens.

ZyWALL USG 300 User's Guide