44.13. Setting Up a Transparent Proxy
A transparent proxy is one that clients connect to without being aware of it, due to the use of firewall rules that redirect connections on port 80 to the proxy system. The advantage of this setup is that you do not have to manually configure all web clients to use the proxy. Instead, they will be connected to it without their knowledge. It also means that users cannot get around the cache and thus avoid its access control rules by not configuring it in their browsers.
Transparent proxying has some down sides to it, however. It is not possible to automatically capture FTP or HTTPS connections, or those to web sites on ports other than 80. It is also incompatible with proxy authentication, as clients cannot ...
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