Error log message

Hi I use freeradius 3.0.x (accounting). I found strange error log message Normal log mode: Fri Aug 7 15:14:09 2015 : Error: Receive - Fri Aug 7 15:14:12 2015 : Error: Receive - Fri Aug 7 15:14:14 2015 : Error: Receive - Fri Aug 7 15:14:17 2015 : Error: Receive - Fri Aug 7 15:14:19 2015 : Error: Receive - When i run radiusd in the debug mode error messages look like: Debug log mode: Receive - Length field value too large, expected maximum of 4096 bytes, got 26209 bytes Receive - Length field value too large, expected maximum of 4096 bytes, got 26209 bytes Pcap is included in the attachment ( between F5 network element and radius instance). The network element is testing RADIUS availability. Thx.