Canon LBP7210Cdn Manual page 678

Select the [Restrict SNMP Monitoring/Setting Changes] check box.
Select [Permit Specified Addresses] or [Reject Specified Addresses].
[Permit Specified
Addresses]:
[Reject Specified
Addresses]:
Set the IP address.
(1) Enter the IP address of a computer of which you want to permit or reject to monitor
and change the settings using the SNMP protocol.
Enter the IP address by separating the numbers with "." (period), for example,
AAA.BBB.CCC.DDD.
(2) Click [Add].
Only users specified in [IP Addresses] can monitor and change
the settings.
Users specified in [IP Addresses] cannot monitor and change
the settings.