I am trying to do something and I am not sure how.
I have a linux box connected to a network. It has two nics. I want to allow network (internet) sharing between the two nics, and then connect a router to the second nic, to allow a few computers to connect to the internet.
However I do not want anyone to be able to ping the little network connected to the second nic to be visible or reachable from the outside world.
any ideas ?