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Administrator’s Guide

Advanced installation topics 27

Figure 2.5: Inline Passthrough with Pre-existing Proxy Server Deployment

Supported pre-existing proxy types

Inline pass-through with proxy filtering requires client traffic to pass through the proxy server. Only

traffic from the proxy IP address is visible to the Barracuda Web Filter. The Barracuda Web Filter

checks each request to determine whether it is allowed or denied. The operation of a proxy can be

classified as being a transparent proxy or a nontransparent proxy. Each proxy type provides its own

set of installation issues when installing the Barracuda Web Filter.

• Transparent Proxies: Transparent deployment of a proxy server relies on a network device

(like a switch or a router) to intercept all traffic from clients to Internet servers and divert it to a

proxy server.

The network device identifies packets to be intercepted by examining IP headers of all incoming

packets. Packets transported by TCP and addressed to port 80 are intercepted. Because HTTP

communication occurs over TCP transport and an overwhelming majority of Internet servers use

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