/usr/sbin/pppoe-connect
/usr/sbin/pppoe
/usr/sbin/pppoe-relay
/usr/sbin/pppoe-server
/usr/sbin/pppoe-setup
/usr/sbin/pppoe-sniff
/usr/sbin/pppoe-start
/usr/sbin/pppoe-status
/usr/sbin/pppoe-stop
You may install this package on Debian with
apt-get
install pppoe