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Administrator’s Guide

Creating block and accept filters 39

MIME type blocking

Use the BLOCK/ACCEPT > MIME Blocking page to specify standard MIME types that you want to

block.

Note:

Web sites that are whitelisted are not subject to the MIME type blocking rules you create.

Many organizations choose to block Internet radio and streaming media because they add load to the

internal network, as well as executable files because they can install viruses and various other

malware. To block Internet radio, which uses MPEG (.mpg, mpega, or .abs) or Microsoft audio (.wav)

files, enter audio/x-mpeg or audio/x-wav as blocked MIME types.

To block streaming media, which uses MPEG video, enter video/mpeg or video/x-msvideo as blocked

MIME types.

To block access to executables (.exe), enter application/octet-streamapplications as a blocked MIME

type.

IP-based filtering

If you suspect that certain users are abusing their access to the Internet or using malicious

applications, you can use the

BLOCK/ACCEPT > IP Block/Exempt page to deny Internet access to

those users or to block them from using certain applications.

Use the source IP address or source subnet mask fields to specify the systems that you want to prevent

from accessing the Internet. Use the destination fields to specify the applications you want to block.

IP-based exemption from filtering and blocking

Use the BLOCK/ACCEPT > IP Block/Exempt page to specify the IP addresses that you want to bypass

the following block filters:

• Content filtering

• IM blocking

• All types of download blocking

Note:

The IP addresses you add to the exempted list will not be protected against spyware, but the

Barracuda Web Filter will still detect spyware activity on these clients.

Block messages

When the Barracuda Web Filter blocks access to a Web site, it displays a message that informs the

user why that site is being blocked. The Barracuda Web Filter blocks a Web site if it contains spyware,

a virus, content that has been blocked, or a blacklisted URL.

Use the

BLOCK/ACCEPT > Block Messages page to perform the following tasks:

• Select the language that the block message is displayed in for all users.

• Customize the message in case the default text is insufficient.

• Select whether login fields appear on the block messages window that users receive when they

try to access blocked content. The login fields allow users to access blocked content if an

exception policy has been created for the blocking filter.

• Enable the Barracuda Spyware Removal Tool by setting the Infection Warning Threshold

field to greater than 0.

• Set a dedicated hostname for the Barracuda Spyware Removal Tool.

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