This isn't all the information that is possible in the link driver
section, but it contains all the important parts for Kali usage.
The CONFIGURATION keyword is just a way to identify this particular
setup. FRAME isn't used with Kali so you can ignore it for now.
PORT and BAUD should be obvious. FLOW CONTROL should always be set
to HARDWARE.

CONNECTION can be set to direct, modem, autodial, demand, or
terminal. This tells ppp.exe what to do when it loads. The direct
and modem options aren't normally used. Set to autodial if you
know the script works. Set to demand if you want to manually start
the script from within pppmenu. Set to terminal if you want to do
the entire login process from a terminal window in pppmenu.