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When using FreeRADIUS with LDAP passthrough authentication, such as OpenLDAP with SASL or Kerberos passthrough, you are very restricted in what you can do.

DeployingRADIUS, Alan DeKok's site, has a handy compatibility matrix that lists authentication systems and their authentication protocol compatibility. LDAP servers with passthrough authentication require you to bind to LDAP as the user, which in the compatibility matrix limits you to PAP authentication and its EAP variations (such as EAP-TTLS/PAP and EAP-TTLS/EAP-GTC with PAP).