rsa key length in EAP-TLS.

Hi all, as of yesterday I have updated the certificates to use a 2048 bit key. The odd thing is that when I start freeradius, I get the message: tls: rsa_key_exchange = no tls: dh_key_exchange = yes tls: rsa_key_length = 512 tls: dh_key_length = 512 the length seems to be 512. (?) I would also like to know if the rsa key exchange should be enabled instead of the dh key exchange, and if so how do I enable it? I could not find anything in the config file. Thank you, Andrea