Zhone 6211-I3 User Manual page 58

Advanced Setup
Enter a filter name, information about the source address (from the WAN
side), and information about the destination address ( to the LAN side). Select
the protocol and WAN interface. Then click on Save/Apply to add the setting.
Figure 46: IP Filtering - Incoming Filter Add
You can view and delete the incoming filter settings from this screen.
Figure 47: IP Filtering - Incoming Filtering List
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6211-I3 ADSL2+ Router User's Guide