The best replacement for pppoa is pppoe.

The best alternatives to pppoa are rated as following:
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  ppoe

Your alternative for pppoa is not listed? Suggest!
Speaking about pppoa, one probably shouldn't forget about exetel.

Other search terms related to pppoa and their ratings are:
★★★★★ exetel
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Google Trends

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pppoa
pppoe
pppoe centurylink