pppoe-server(8) on Linux
The text 50391323c52a, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
user-space PPPoE server
Flags it lists
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-C -
-F -
-I -
-L -
-N -
-O -
-Q -
-R -
-S -
-T -
-X -
-f -
-h -
-i -
-k -
-m -
-o -
-p -
-q -
-r -
-s -
-u -
-x