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Transparent Web Caching with Complete IP transparency configuration



We are looking to use two Cisco routers in a redundant configuration that can achieve the following

There is a public IP pool on the inside interface with multiple client end points. All the HTTP request originating from these clients need to be processed through a cluster of transparent web cache servers connected to these routers on a different subnet & interface(s). 

Further for a cache miss, the web cache server (working in complete IP transparency mode) need to fetch the page from the origin server over the Internet which is accessible via another interface connected to the router(s), however there is a requirement that the source IP visible to the origin server on the Internet must be the same as that of the original client which it received in the request from the client on the inside interface. 

The response received from the origin server needs to be sent back to web cache which in turn will send back the response to the client. 

The issue with WCCP + GRE approach seems to be that it does not allow the complete IP transparency for requests which the web cache originates, although to the clients it is fully transparent. 

Can this configuration be achieved by say using some static NAT twice (once for the routing to web cache and then towards the Origin server which finally resolves to the original public IP as the source).

Also, the Router redundancy is required and a mechanism to distribute the load on the cluster of servers such that the responses from the origin server are also sent back to the same server that originated the request.

Any pointers will be of great help, thanks.




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