How to log failed login attempts?

[bastardinho69]

Hi,

i am using FreeRADIUS 2.0.5. Successfull logins into cisco routers are 
logged great (using Accounting), but i need to log also the failed 
attempts. In /var/log/radius.log radius does log the failed attempts, 
BUT if in clients.conf i have created client as 10.0.0.0/8 (a network, 
not a host), then in the log file i will see the NAS ip address 
10.0.0.0/8, which is not enough. I need to see the exact NAS ip address. 
It would be insane to add every single router into the clients.conf 
file, so i assume there is a way how to solve this.

I hope u guys can help me, i will appreciate it ;)
Thanks.