This daemon listens for RADIUS packets on a well known UNIX domain socket. When a packet is received, it queries LDAP to see if the user is configured for RADIUS authentication. If so, then the packet is forwarded to the 3rd party RADIUS server. Otherwise, a bind is attempted against the LDAP server. https://fedorahosted.org/freeipa/ticket/3366 http://freeipa.org/page/V3/OTP