Default filters are automatically set up in nbapolicy.xml. The default filters enable the NBA to analyze (but not decrypt) all network traffic. They also enable the NBA to send files and emails to policy engines for analysis. If you remove these default filters, the NBA ignores all network traffic.
Set Default Filters to 'Ignore' If You Add New Filters
If you add filters for specific protocols or IP address ranges, we recommend that you set the default filters to have an Ignore action. This configuration ensures that all incoming packets are processed by a specific filter and are accounted for in the statistics logs.
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