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Barracuda Web Filter Release 3.3

28 Chapter 2: Installation and Configuration

the default port 80, this method captures most of the HTTP request traffic flowing through the

network device.

If you are installing a transparent proxy, the Barracuda Web Filter must be installed on the client

side of the proxy. This position allows the Barracuda Web Filter to intercept all Internet traffic.

• Nontransparent Proxies: Nontransparent proxy deployment refers to a deployment where the

client is made aware of the proxy server’s existence. Then clients send their HTTP requests to

the proxy regardless of the servers specified in the URLs.

In addition to document retrieval, these clients also delegate DNS resolutions to the proxy

server, and a browser sends to its proxy server the entire requested URL.Then if needed, the

proxy server resolves the hostname into an IP address and retrieves the object from that address.

This is different from the actions of clients accessing the Web directly. When accessing the Web

directly, the client obtains the origin server’s IP address and sends the HTTP request containing

just the path portion of the URL to that address.

Connecting inline to your network with a pre-existing proxy

server

To set up the Barracuda Web Filter inline with your existing proxy server, place the proxy server

between the Barracuda Web Filter and your internal network switch.

If you have a proxy server, most HTTP requests are routed from your internal network through the

proxy server to the Barracuda Web Filter. When a Web site responds, the responding traffic goes

through the Barracuda Web Filter, which filters any spyware and viruses before allowing the traffic

to go through the proxy server and back to the clients.

The Barracuda Web Filter has been tested with Microsoft ISA and Squid proxy servers.

To connect your Barracuda Web Filter and existing proxy server to your network:

1. Connect your LAN port from your proxy server to the Uplink port of your internal network

switch.

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Barracuda Networks 4 Especificaciones Pagina 28