I have a Cisco ASA 5510 that is protecting 2 WAN connections for my business (Detailed diagram attached). 1 WAN connection goes to the public Internet. The other WAN connection goes to our corporate network, which also provides access to the Internet
Internally, I use a proxy server to guide proper traffic from workstations to the corporate network, so essentially, all traffic to the corporate network comes from one device. We need to route some Internet-accessible addresses through the corporate network for access-control and monitoring reasons.
What is the best way to force all traffic from my proxy server to route properly over the corporate network interface?
The ASA is running v8.3(2). I have tried a reverse-NAT for the corporate router, access-control rules, and a thousand other things. I'm totally fried and at a loss. Thanks for the help!