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Administrator’s Guide

Deploying the Barracuda Web Filter 13

Forward proxy

The forward proxy deployment uses a proxy as an intermediary between a client and the Internet to

protect the client from being visible from the Internet. In a forward proxy deployment, only HTTP

Internet traffic passes through the Barracuda Web Filter. After the Barracuda Web Filter processes

clients’ requests, it sends the requests out directly to the Internet.

When deployed as a forward proxy, the Barracuda Web Filter shows all HTTP traffic as coming from

its own IP address instead of from the individual client IP addresses as is done in the inline pass-

through deployment.

We recommend deploying the Barracuda Web Filter in forward proxy mode in the following

situations:

• You need to replace an existing forward proxy (such as Microsoft ISA Server) with the

Barracuda Web Filter.

• You do not want the Barracuda Web Filter to reside inline with all your network traffic and are

satisfied with the system only scanning HTTP traffic for viruses and spyware.

The following table describes the advantages and disadvantages of deploying your Barracuda Web

Filter in forward proxy mode.

Figure 1.3 illustrates a basic installation using the Forward Proxy Deployment.

Advantages Disadvantages

The initial setup of forward proxy mode

does not require any interruptions to your

network traffic.

Because the Barracuda Web Filter only scans

outbound HTTP traffic, the system cannot perform

the following functions in forward proxy mode:

• Block access to applications listed on the

BLOCK/ACCEPT > Applications page.

• Block access to applications that use the

destination IP address specified on the

BLOCK/ACCEPT > IP Block/Exempt page.

• Block access to applications that use the

destination port specified on the

BLOCK/ACCEPT

> IP Block/Exempt

page.

• Inspect outbound traffic for spyware infection

activity.

Does not require the configuration of static

routes.

The Barracuda Web Filter does not scan non-HTTP

traffic for viruses and spyware.

Requires clients’ Web browsers to be configured with

the IP information of the forward proxy server

(Barracuda Web Filter).

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