SMC Networks SMCWBR 14-GM - Manual (Page 32)

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MAC Filter
This option lets you control the Wireless clients connectiong to your MIMO Wireless Router.
Each on of them will be checked before letting them connect wirelessly. This option does not
work for wired client PCs. You can select from two different policies:
Allow: will let all computers access the network, except the ones appearing on the list
Block: will not let any computers accessing the network unless they are on the list.