Canon i-SENSYS LBP6670dn User Manual page 671

[TX Filter]
[RX Filter]
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Select the [Use Filter] check box, and then select [Default Policy].
If you select [Reject], you will not be able to transmit or print from users (clients) entered in the [Exception Addresses]
field.
If you select [Allow], you will only be able to transmit or print from users (clients) entered in the [Exception Addresses]
field.
If you clear the [Use Filter] check box, you will be able to transmit and print from all users (clients).
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It limits the sending of data from the printer.
It limits the sending of data to the printer.