Canon MF247dw User Manual page 333

Network
Reducing power consumption
You can set the machine to enter <Power Save Mode> based on signals emitted from the wireless router.
Power Save Mode (P. 474)
If the IP address of the machine has changed
In a DHCP environment, the IP address of the machine may be changed automatically. If this happens, the
connection is maintained as long as the machine and the computer belong to the same subnet.
LINKS
Connecting to a Wireless LAN (MF249dw / MF247dw)(P. 319)
325