configuration tips

[Guest]

[fcforensic]

Hello everyone, I use version 2.4.0 Kernel 2.6.27.19-72.e25
I want to make the following configuration:
Green is the network I get a Red network with a DSL router that its second private network, which
turn is reachable through a router and with its own DNS.
In practice the two private networks communicate with each other and should itself be protected from access by
Internet.
The proxy should allow users to access both the green websites internet sites published
the second private network. I hope I have been clear.
Thank you all for suggestions