How to organize routing from the main gateway to a transparent proxy server?

Question

proxy

Hello, there is a Domain Controller (Serv1), it is also specified as a gateway in workstations, if you connect a Proxy server (Serv2) to the network, how to configure Internet traffic routing from the main gateway (Serv1) to a proxy (Serv2).
The proxy is transparent. (looks to the Internet and the local network)
Win Server 2008 R2 domain controller (looks to the local network)

Answer 1

Specify the proxy server as the gateway