After reading the post properly I will try again....

What is your switch on the 10. network?

For you to be able to get onto the 192 network, you will need a router such as the broadband router thingy.
Configure your dhcp server to hand out a default gateway of the address of your router for each of your workstations.
The address of the router whould usually be configured at the router itself rather than by your DHCP server.