Canon LBP251dw User Manual page 226

[IPv4 Address: Outbound Filter]
Select to restrict sending data from the machine to a computer by specifying IPv4 addresses.
[IPv4 Address: Inbound Filter]
Select to restrict receiving data from the machine to a computer by specifying IPv4 addresses.
[IPv6 Address: Outbound Filter]
Select to restrict sending data from the machine to a computer by specifying IPv6 addresses.
[IPv6 Address: Inbound Filter]
Select to restrict receiving data from the machine to a computer by specifying IPv6 addresses.
5
Specify the settings for packet filtering.
● Select the default policy to allow or reject the communication of other devices with the machine, and then
specify IP addresses for exceptions.
1
Select the [Use Filter] check box and click the [Reject] or [Allow] radio button for the [Default Policy].
[Use Filter]
Select the check box to restrict communication. Clear the check box to disable the restriction.
Security
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