Sometimes Linux LiveCDs configure hardware better than traditional installed distros.
Given this information about the new Digiweb conditions, Giancarlo had, to use his own words, “the insane idea to test the new modem and connection with a Knoppix Live CD”. Knoppix indeed did connect to the Internet all by itself, so then it was only a matter of finding and copying the correct configuration parameters into the proper Slackware files.