I have a question regarding configuration of these. Prefacing that I know that they work above the Layer 3 layer, so I'm more trying to determine how they interact with L3.
An explicit proxy is pretty easy, your browser has the settings configured to use the proxy to communicate and it points the web traffic to that address. All your underlying Layer 4 architecture works as it should, gateways are your routers out of the network or firewalls, etc...
How do transparent proxies work exactly? Does the router/firewall point to the proxy as a next hop? Does the proxy intercept ARP requests and provide it's own MAC if it detects outbound traffic? Is it physically in-line behind a router and intercepts all protocol appropriate traffic?
I've only ever worked with explicit proxies and a smidge not sure how transparent ones work in deployment.
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