When configuring
configure set service pppoe-server interface eth1 set service pppoe-server gateway-address '192.0.2.1' set service pppoe-server client-ip-pool RV-POOL range '192.0.2.100-192.0.2.110' set service pppoe-server default-pool 'RV-POOL' set service pppoe-server authentication mode 'local' set service pppoe-server authentication local-users username test password 'test' set service pppoe-server authentication protocols 'mschap-v2' commit
And then changing protocol e.g.:
set service pppoe-server authentication protocols 'pap' commit
protocol is not changed during commit, as the server is not restarted, accel-ppp-ng authentication methods are implemented as modules, so this setting changes list of needed modules, and this requires server restart.