Ringdale ISDN - Manual (Page 147)

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All the above choices for filtering concern only Ethernet II
frames. If your Ethernet network uses an Ethernet 802.3
or other types of frames, then the above filtering features
will have no effect regardless of whether they are Disabled
or Enabled.
After pressing the Enter key for Other Filtering, the
following message will appear:
Is the above setup information correct? (y/n) -
Type n to start over with this section.
Type y to use the current settings. While the settings will be
used by the router, they are not actually saved. To save the
settings, you must select SAVE from the command prompt of
the OverLAN Operating System.
You may now go to Task 8.
CONFIGURING WITH A LOCAL CONSOLE