What is the purpose of the default accounting-on/off queries?

Hello everyone, I have two questions: 1) What is the purpose of the default accounting-on and accounting-off queries bundled with freeradius? I am asking this because one of my customer's NAS is sending accounting-on packets for no reason, and Freeradius is closing the sessions with the 'NAS-Reboot' Acct-Terminate-Cause. I was thinking about disabling the accounting-on query altogether, and leaving only the accounting-off. Are there any side effects by doing this? 2) Does Freeradius use accounting-off packets to release IPs allocated in the sqlippool? Regards -- Att, *Antônio Modesto*