Thank you very much!
I think I will study network related things more, especially PPP as you mentioned.
Is it the case that if I can bridge my FTTH connection and a dial connection / Voice over IP I can make my simple ISP?
Update: I searched online, and some keywords I found were dial on demand and NAT. I am sort of familiar with NAT, I did those settings when I was using ADSL modem years ago to host my server with Sigmarion 1. Now, dial on demand, no... I have to be careful of security stuff, haha.
Oh yes, speaking of phone booths, there are quite a bit of ISDN ones in certain places. I think I'll look into that old tech.
Edited by stingraze 2018-06-22 1:57 PM