You can use RASPPPOE. It's on my personal homepage: dosdiy.myrice.com, and it's easier to use than EnterNet 300. If your operating system is WIN98 Second Edition, you need to run the patch first. You can download it from Microsoft's homepage, the URL is:
http://download.microsoft.com/download/win98SE/Update/Q243199/W98/CN/243199CHS8.EXE
Brief introduction to RasPPPoE:
RasPPPoE is one of the best ADSL dial-up software tools. Unlike others, it integrates perfectly into
Windows Dial-Up Networking, so you no longer have to use those ADSL dial-up programs that take up system resources
and also take a long time to log in and dial up.
It also lets third-party software dial directly. It uses Windows' original
Dial-Up Networking to add support for the Point-to-Point Protocol Over Ethernet (PPPoE) communication proto-
col, letting you connect to the Internet over ADSL directly through Dial-Up Networking, and it supports China Telecom
(China), Chunghwa Telecom, HiNet (Taiwan), Cyber Express Communica-
tion Ltd. (Hong Kong), etc.
Although WIndows XP already has the PPPoE protocol built in, using this software can give you
more functions.