Transparent Proxy Caching and ARM > Interception strategies > Using policy-based routing

Using policy-based routing

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.

All client Internet traffic is sent to a router that feeds Content Gateway.

The router sends port 80 (HTTP) traffic to the proxy and sends the remaining traffic to the next hop router.

The ARM translates intercepted requests into Content Gateway requests.

Translated requests are sent to the proxy.

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.

Transparent Proxy Caching and ARM > Interception strategies > Using policy-based routing