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Web Interface Settings Glossary 90
Filters Menu (IP Tree)
Edit filters
IP filtering provides you with the means to implement customized security, usage, and
cost control measures. For example, you can define filters to do the following:
• Drop all data from a specific address or network.
• Only accept data from a specific address or network.
• Drop traffic from an application to limit usage charges.
Filters are defined in a stack. Up to 8 filters can be combined together to obtain
sophisticated results. As soon as you enable a filter, all incoming and outgoing data is
cascaded through the filter stack as shown by the arrows.
Any data that is not caught by a filter is passed on to the next filter in the stack. Data
caught by a filter is either forwarded (green door) or dropped (red door). The final filter
in the stack always drops all data.
Forwarded data continues in the direction it was originally going, either in or out.
Dropped data is discarded. See
Custom Security Features using IP Filters on
page 63, for more information.