Canon LBP7210Cdn Manual page 567

Specify [IP Address], [Subnet Mask], and [Gateway Address].
[IP Address]:
[Subnet Mask]:
[Gateway Address]: Enter the gateway address that is being used on the TCP/IP network.
NOTE
When using DHCP, BOOTP, or RARP
After the network board of the printer is reset, the values obtained from DHCP, BOOTP, and
RARP are displayed.
(If the values have been specified previously, they overwrite the obtained ones.)
If you changed the IP address
If you changed the IP address of the printer after installing the printer driver, reset the port to be
used for the printer driver.
For details on the procedure for resetting the port, see
Select [On] for the option to be used when setting the IP address, as needed.
Enter the IP address of the printer.
Enter the subnet mask that is being used on the TCP/IP network.
"Setting the IP Address".