L2TP and LNS queries

Hi, I am currently trying to setup and configure a freeRADIUS box that will authenticate customers being forwarded from a Juniper device (MX240). We are using standard, included package of mySQL (MariaDB). I am currently stiuck at this point as I have configured Cisco NAS via Clients.conf anf proxy.conf but that was for Eduroam. Is it very similar with Juniper? Waht are the atrributes? Has anyone achieved this before? Thanks Clive