Thanks, Jörgen, I never thought of looking at the wlan# interface definitions to be able to change the MTUs in WebAdmin - just like the eth# interfaces. [:O]
I checked using my iPhone 6 and the SpeedTest app:
Connected to the wireless router (not going through the UTM): 23/2Mbps
UTM Version 9.302-2 Sophos AP 30 on eth0 (MTU 1500) Connected to SSID Guest on wlan0 (MTU 1500): 2.21/2.07Mbps Connected to SSID Guest on wlan0 (MTU 1490): 2.23/2.07Mbps Connected to SSID Guest on wlan0 (MTU 1400): 2.21/2.07Mbps
Sophos AP 30 on eth0 (MTU 1490) Connected to SSID Guest on wlan0 (MTU 1490): 2.22/2.06Mbps
Sophos AP 30 on eth0 (MTU 1400) Connected to SSID Guest on wlan0 (MTU 1400): 2.21/2.07Mbps
Sophos AP 30 on eth0 (MTU 1500 and 1280) Connected to SSID Guest on wlan0 (MTU 1280): 2.20/2.07Mbps
Cheers - Bob
Sophos UTM Community Moderator Sophos Certified Architect - UTM Sophos Certified Engineer - XG Gold Solution Partner since 2005