the problem with proxy is if you use some form of stickyness like sticky src ip.

Since the src ip is always the proxy, you end up with all your traffic going to a single server.

If you are doing sticky src ip, I would suggest to use arrowpoint-cookie instead.

To see the real-ip you need your proxy to insert in the http header a 'x-forwarded-for' line with the client ip.

Your servers can then extract this value to determine the client ip.

On the CSS you won't be able to see the client-ip.

Gilles.