Reservation of IP address on DHCP
The best way to reserve a permanent IP address to a specific Index printer is via Reservation of this IP address on the router in your LAN. This is typically a task for the Network Administrator. The printer is specified with it's MAC address. Print the MAC address by pressing HELP+1 on the control panel.
For detailed information, search on Google for "Reservation of IP address on DHCP + (Your router name)".