dhcp server and logging

[BASSAGET Cédric]

Hello.
I don't understand what is missing in my config to make freeradius (3.0.12)
logging what is doing about DHCP queries / replies.
I'm using module dhcp_sqlippool, which set things like :

        sqlippool_log_exists = "DHCP: Existing IP:
%{reply:Framed-IP-Address} (did %{Called-Station-Id} cli
%{Calling-Station-Id} port %{NAS-Port} user %{User-Name})"

        sqlippool_log_success = "DHCP: Allocated IP:
%{reply:Framed-IP-Address} from %{control:Pool-Name} (did
%{Called-Station-Id} cli %{Calling-Station-Id} port %{NAS-Port} user
%{User-Name})"

        sqlippool_log_clear = "DHCP: Released IP %{Framed-IP-Address} (did
%{Called-Station-Id} cli %{Calling-Station-Id} user %{User-Name})"

        sqlippool_log_failed = "DHCP: IP Allocation FAILED from
%{control:Pool-Name} (did %{Called-Station-Id} cli %{Calling-Station-Id}
port %{NAS-Port} user %{User-Name})"

        sqlippool_log_nopool = "DHCP: No Pool-Name defined (did
%{Called-Station-Id} cli %{Calling-Station-Id} port %{NAS-Port} user
%{User-Name})"


But nothing is logged. And I can not find the good doc to learn how linelog
works.I found this thread :
http://freeradius.1045715.n5.nabble.com/DHCP-in-FreeRadius-3-and-logging-td5749707.html

But It did not help me. I'm missing something...

Can somebody help me / point me in the right direction ?
Regards.