Web Gateway 7.1.5 Product Guide - McAfee

Bandwidth throttling
Web filtering
Supporting functions 6
You can limit the speed for uploading and downloading data to the appliance in a process also known as
bandwidth throttling. This section explains how this process is configured and provides two examples of
bandwidth throttling rules.
You can use bandwidth throttling, for example, to avoid a situation where the network performance you
need for completing a particular task is impacted by other users who are individually uploading objects
to the web or are requesting large downloads from the web.
Bandwidth throttling events
Two events are available for use in rules that can trigger bandwidth throttling:
• The Throttle.Client event limits the speed of data transfer from a client to the appliance. This is the
case when a client sends a request for uploading an object to a web server and the request is
intercepted on the appliance together with the object.
• The Throttle.Server event limits the speed of data transfer from a web server to the appliance. In this
case, there has been a client request to download an object from a web server, and after this request
has been filtered on the appliance and forwarded, the web server sends the object in response.
The transfer speed is measured in Kbps (kilobits per second). The events both have a parameter for
specifying the maximum speed that should be used during a transfer. The lowest value that you can
specify here is 10 Kbps.
Bandwith throttling rule for uploads
The following is an example of a rule that can execute bandwidth throttling rule for uploads.
Note: The example shows approximately how the rule appears on the user interface.
Name
Limit upload speed for hosts on throttling list
Criteria Action Event
URL.Host is in list Upload Throttling List –> Continue – Throttle.Client (10)
The rule uses the Throttle.Client event to limit the speed with which uploads are performed to 10 Kbps
if the web server that the data should be uploaded to is on a particular list.
In the criteria of the rule, the URL.Host property is used to retrieve the host name of the web server
that is specified in the uploading request.
If the Upload Throttling List contains this name, the criteria is matched and the rule applies. The
throttling event is then executed.
The Continue action lets rule processing continue with the next rule.
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