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Transparent Proxy and ARM > Transparent interception strategies > Transparent interception with policy-based routing
Transparent interception with policy-based routing
Help | Content Gateway | Version 8.2.x
Instead of the WCCP protocol, you can use the policy routing capabilities of a router to send traffic to Content Gateway. WCCP or a Layer 4 switch are generally preferable to this configuration because policy-based routing has a performance impact on the router, and policy-based routing does not support load balancing or heartbeat messaging.
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All client Internet traffic is sent to a router that feeds Content Gateway.
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The router sends port 80 (HTTP) traffic to the proxy and sends the remaining traffic to the next hop router.
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The ARM translates intercepted requests into Content Gateway requests.
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Translated requests are sent to the proxy.
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Web objects to be served transparently are readdressed by the ARM on the return path to the client, so that the documents appear to have come from the origin server.
A Content Gateway cluster with virtual IP failover adds reliability; if one node fails, another node can take up its transparency requests. See Virtual IP failover.

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