I have this situation:
1250 Autonomous (latest IOS, clean config, set ssid, wpa2, channel width 40 MHz). When I send file by FTP I get this:
Client => FTP 10-12 MiB
FTP => Client 11-13 MiB
But after converting this AP to LAP and connecting to WLC (4402) I get this
Client => FTP 13 MiB
FTP => Client 6 MiB
My laptops are:
Dell d620 with Intel WiFi Link 4645 latest driver
Lenovo t400 with Intel WiFi Link 5300 latest driver
Sw ver for WLC 4.2.130 and 5.1
I also tried Windows SMB, same issue, upload OK, download slow. Switch and FTP server are OK - tested by 1GB wire connection.
Maybe someone had similar case.