pppoe-relay(8) on Linux
The text 1fceaabdeec4, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch) shipped it.
user-space PPPoE relay agent.
Flags it lists
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-B -
-C -
-F -
-S -
-h -
-i -
-n