here is my config:
/radius
add accounting-backup=no accounting-port=1813 address=10.223.101.9 authentication-port=1812\
called-id="" disabled=no domain="" realm="" secret=secret service=\
ppp,login,hotspot,wireless,dhcp src-address=10.224.0.1 timeout=300ms
/radius incoming
set accept=no port=3799
/ppp aaa
set accounting=yes interim-update=0s use-radius=yes
/interface pptp-server server
set authentication=pap,chap,mschap1,mschap2 default-profile=default enabled=yes\
keepalive-timeout=30 max-mru=1460 max-mtu=1460 mrru=disabled
