Ubuntu 12.04 Server x64 + Stargazer + Ubilling?

Question

Time Management

Hello, tell me how to do it right:
There is a provider, the Internet connection goes through pppoe or pptp (vpn), in our office we want to make our network local and global via pppoe or pptp
The billing will be Stargazer + Ubilling, Ubuntu 12.04 server, There is a PC it has two network ones
. One includes the Internet from the city provider, on the other, they plan to distribute it:

Is the scheme correct, or is it better to install a router that will immediately distribute the Internet to the server, and the server will distribute further via pppoe or pptp according to the tariff plan.
P.S. access to the local network should always hit, and to the Internet only to those to whom we will issue a login and password
Or there are other options, and easier

Answer 1

The billing will be Stargazer + Ubilling, Ubuntu 12.04 server, There are two PCs in it

To start with, ubuntu is not a recommended and generally supported platform for Ubilling
and end up with a PPP backup in 2014 which is pretty... ahm... amusing
That is a self-evident option that suggests itself - a normal IPOE.
Actually, the task is quite trivial and is more than accessible in the official documentation and has been discussed many times in the community forums.

Answer 2

Tell me where you can find detailed information on how to make PPPoE authorization
Server and Billing installed - but there from the box, as I understand it, only ip + mac