detail files and accounting Alive packets

[Christopher Carver]

Several NAS's we lease, whose configurations we cannot change, 
authenticate through our freeradius server.  The Alive packets we are 
receiving from these machines are filling up our hard drive.  Is there 
any way to deny just these Alive type packets and continue to accept 
Start and Stop packets?  Everything I read seems to indicate this is 
impossible.  Can someone please confirm or deny?

Thanks