Canon i-SENSYS MF729Cx Important Safety Instructions And Installation Manual page 339

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 (MF729Cx / MF728Cdw / MF724Cdw / MF628Cw)