Accounting Packets and Anonymous Identity

Selahattin Cilek selahattin_cilek at
Sat Feb 4 21:39:12 CET 2017

I have been checking the traffic between NASes and FreeRADIUS (2.2.9) 
and I have come across accounting packets with the User-Name field set 
to "anonymous."

Sun Nov 13 02:41:50 2016
     Acct-Session-Id = "57B6F41F-000014D2"
     Acct-Status-Type = Start
     Acct-Authentic = RADIUS
     User-Name = "anonymous"
     NAS-Identifier = "KAT_8_MERDIVEN"
     Called-Station-Id = "DC-9F-DB-34-CF-B4:TDV.NET"
     NAS-Port-Type = Wireless-802.11
     NAS-Port = 0
     Calling-Station-Id = "F8-16-54-1E-AB-2C"
     Connect-Info = "CONNECT 0Mbps 802.11b"
     Acct-Session-Id = "57B6F41F-000014D2"
     NAS-IP-Address =
     FreeRADIUS-Acct-Session-Start-Time = "Nov 13 2016 02:41:50 EET"
     Acct-Unique-Session-Id = "6c4322c41296866a"
     Timestamp = 1478997710

1. This server does not use MySQL and keeps the accounting data in plain 
text files. If I were using MySQL as the back-end, would I still see the 
user's  name as "anonymous" in the "radacct.username" field?

2. Is it possible to find the true identity of the user by means of 
reading some files or an SQL query and using the other data provided in 
the packet such as Acct-Session-Id, Calling-Station-Id or 
Acct-Unique-Session-Id etc?

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