There are two ADSL modem routers (nothing fancy, TP-LINK) each with a local network of a small number (variable, but usually <10) of computers.
On one network, there is a SAMBA server on Ubuntu 11.04.
The reason for the second ADSL line was to give one building its dedicated bandwidth, so that up / down traffic from the other computers doesn't affect that building.
What are the ways to make this SAMBA server accessible to this second network, while maintaining the advantage of isolated bandwidth?
I've seen Routing for multiple uplinks/providers, but it doesn't seem to be the answer.