Routing problem

I’m adding DSL to a remote office. That office had Internet via WAN to the home office. I’m using a LinkSys DSL router, but have DHCP turned off. DHCP must come from our SQL server because of a SQL App we are runing. IP addresses are DSL router 10.50.10.89 mask 255.255.255.0, SQL server 10.50.3.2 mask 255.255.0.0, issuing IP range 10.50.10.1-100, WAN router 10.50.1.1. The problem is the only way to get to the internet via DSL router is to specify a workstation IP addr instead of accepting DHCP.The Default Route on SQL is 10.50.1.1. If I change the Default Route to 10.50.10.89 the SQL App stops working. I have added a gateway addr of 10.50.10.89 to the SQL box.