I've learned that ppoe devices are oftem custom built to specs of the local phone company/isp , and are generally configured to support Windows XP Home right out of the box
Just figuring ut the default IP address can be a challenge as the same IP may be used by both the computer and the modem!
For LINUX or Windows Servers, you usually waste time on the documentation and then call tech support and hope you get someone intelligent!
Bell Canada is a large phone company/ISP in Canada, their version of the Speedtouch isn't the same as other Canadian phone companies, so searching the web just confused things.
I ended up using an XP machine which worked immediately. Once I had it working I made notes, learned how to access the Speedtouch setup menu ( NOT as shown in the doucuments that were about a year out of date ) and was able to configure it for LINUX only after tech support told me how to configure the SpeedTouch