Chicago Tribune: How to connect your Linux box to the Internet

Setting up your modem to connect to an Internet Service
Provider under Linux via a PPP connection can be a daunting task
without some guidance.
To tell the truth, it’s not all that
difficult, but the process is different than setting your modem up
on a Macintosh or in Windows. With a little script editing,
however, you’ll be dialed-in and surfing in no time.”

“This article assumes you have:
A properly working version of Linux to which you have root access.
(Kernel 2.2.x is preferred, but you can use this as a guide with an
older kernel.)”

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