| A few decent things I could find online that jive with what I remember: https://www.patton.com/technotes/build_yourself_an_isp.pdf http://www.gwi.net/behind-the-scenes-of-a-90s-internet-start... https://news.ycombinator.com/item?id=8352432 The absolute minimum, and representative of the very first dial-up ISPs: http://www.linuxjournal.com/article/2025 http://www.datamation.com/erp/article.php/615281/My-own-priv... There used to be a lot of nice material on this subject but a lot of it has been obsolete and rotted away from the web over the last 15-20 years. The larger dial-up ISPs used Cisco AS series boxes (or equivalent) with PRI (i.e.: phone over T1) connections (24 lines/each) to a centralized RADIUS server for authentication. They are/were the last hold outs providing dial up. Smaller ISPs were more of a '94 to '99 thing. Usually they used cyclades or equivalent serial port cards with up to 16 serial ports per card and an external modem per port. Eventually this morphed into boxes with multiple modems in them and access servers that did the ppp termination and the authentication (to a RADIUS server) as scale increased. US Robotics was probably the best reputed player in the modem space. |
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