ftp://81.30.226.136/bezdratove_site/Buffalo/drivers_SW/manuals/whrg54/katsuyo/chapter11.html
The feature that Buffalo calls "Privacy Separator" is known to the rest of the world as "AP Isolation" or "Client Isolation", this feature is in DD-WRT and works well.
Block communications between wireless PCs via AirStation.
With a connection setup like that shown in the diagram below, setting this function will prevent computer A and computer B from communicating via AirStation.
(Computer C, which has a cable connection, can still communicate with computers A and B)
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Even if you enable the Privacy Separator function, you will not be able to block communications between two PCs if there is even 1 section of cable connection between them.
For example, in the diagram below, even if the Privacy Separator function is enabled, computers C and A (as well as computers C and B) can still communicate. (This is because there is a cable connection between the two AirStations.)
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Setup the Privacy Separator function as follows:
1.
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Display the AirStation Setup dialog.
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2.
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Display the Wireless Setup dialog.
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Click [LAN Setup] on the left of the dialog.
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3.
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Enable the Privacy Separator function.
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Select the [On] checkbox.
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4.
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Register the setup contents.
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Click [Set] in the dialog mentioned in Step 4.
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The message "The following function has been set." appears. Check your settings, then click [Set].
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This completes the Privacy Separator setup.