I have some basic questions to better understand accounting into SQL.
1. Using NTRadPING, should I get entries in my radacct table?
No. Those are authentication, not accounting requests.
2. I have uncommented the sql_log, and all the detail log sections, and in the accounting section, and uncommented the sql in the accounting section. What other changed are required assuming that I am already successfully authenticating from the radcheck table?
You don't need all that. Just sql in accounting. Detail writes to files.
3. Is there a more detailed how-to on the internet (I guess my google-foo is not as good as others) specifically on accounting in mysql?
Configure sql connection details in sql.conf. Uncomment sql in accounting section of the default virtual server. That's it.
3.b) ... sepecifically on MAC authentication?
http://wiki.freeradius.org/Mac-Auth Ivan Kalik Kalik Informatika ISP