If there is an existing proxy in the district network, the browsers will already be addressing the proxy. Installation in this situation involves changing the current proxy address to the the iWayPatrol filter address. A new address is then established for the proxy server.
All traffic is routed between the Filter Server and the proxy.
This solution works with all existing proxy servers and has the advantage of requiring no additional effort in re-addressing the browser proxy addresses. Some care is necessary to assure that the router recognizes the change in addresses.