Configuring with Web Based Management 
  6.6 "Interfaces" menu 
SCALANCE W780/W740 to IEEE 802.11n Web Based Management 
Configuration Manual, 08/2018, C79000-G8976-C267-13 
303 
On this page you specify when roaming is performed.  
●  On connection termination 
(only in access point mode
) 
If the wired Ethernet interface is no longer available the WLAN interface is turned off. The 
clients roam and then connect to a different access point. As soon as the first access 
point reaches the server again it switches its WLAN interfaces active again. 
●  When the destination address is unreachable. 
Roaming depends on destination addresses. To monitor the device sends pings to the 
configured destination addresses at regular intervals.  
–  Interface monitored using a destination address 
If no ping response is received from this destination address, the access point or the 
client switches off the corresponding interface.  
–  Interface monitored using several destination addresses 
Only when no ping response is received from any of these destination addresses does 
the access point or client switch off the corresponding interface. As long as at least 
one destination address is reachable, the interface remains active.  
The device sends a disassociation frame, for example, to the WLAN clients connected via 
this VAP interface. The WLAN clients roam and connect to a different VAP interface. If 
the address becomes reachable again, the connection can be established again via this 
VAP interface. 
The possible settings differ for access point and client.