I am in a Networking course, the course employs a Cisco packet tracer to practice before the real implementation, but I only use GNU/Linux (Debian Squeeze) and I need to configure a next network like this one:
pc_1 <----> hub_1 <------> router_1 \
\
\ Cloud(frame relay)
/
/
/
pc_2 <----> hub_2 <------> router_2
My searches reveal little about frame relay in GNU/Linux. Any idea?