ZyXEL Communications IES1248 User Manual
IES 1248 Support Notes
All contents copyright (c) 2006 ZyXEL Communications Corporation.
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Please select port 1 and clear the NetBios check box. Meanwhile, you will see Filter
Out in NetBios check box. Press Add button make the change take effect.
So you will see the port 1 will block the NetBios protocol packets.