OSX Sierra, how do I create a ppp0 interface?

I tried the obvious:

sudo ifconfig ppp0 create

ifconfig: SIOCIFCREATE2: Invalid argument

The pppd manual refers to a ppp0 interface but my system lacks one.

How do I get one?

Thanks

**vp

BTW I am not interested in PPPofE, I want to create a ppp tunnel.