Here is my situation, I'm at a place "in space and time", where there is only dialup. :/

The Linux box is using a modem via dialup to connect to the Internet. It is working, the ppp0 interface is up, hence I am able posting this.

I have a Mac with no modem, but it has a network card and wifi card, but there is no wifi in this area. Both the Mac and the Linux seem to have a socket on the back for an ethernet(?) cable.

How can I connect the Mac to the Linux box, so that the Mac can use the net too using the Linux's dialup connection?