Canon LBP-3300 Network Manual page 127

IMPORTANT
When [Permit Specified Addresses] is selected, you cannot access from an
unauthorized MAC address. Therefore, confirm the MAC address when entering it.
If there is no corresponding MAC address, you cannot access the network. In this
case, you need to initialise the network settings. (See "Initializing the Network
Settings," on p. 5-8)
7
Enter the MAC address of a device of which you want to
permit or reject accessing, and then click [Add].
Enter twelve-digit alphanumeric characters as 0123456789ab without separating
them with a hyphen (-) or colon (:).
NOTE
Up to 20 MAC addresses can be entered.
Managing the Printer Using the Remote UI
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