70 lines
2.4 KiB
Plaintext
70 lines
2.4 KiB
Plaintext
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# Configure Thresholding and Suppression
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# ======================================
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#
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# The threshold command is deprecated. Use detection_filter for thresholds
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# within a rule and event_filter for standalone threshold configurations.
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# Please see README.filters for more information on filters.
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#
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# Thresholding:
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#
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# This feature is used to reduce the number of logged alerts for noisy rules.
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# This can be tuned to significantly reduce false alarms, and it can also be
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# used to write a newer breed of rules. Thresholding commands limit the number
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# of times a particular event is logged during a specified time interval.
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#
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# There are 3 types of event_filters:
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#
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# 1) Limit
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# Alert on the 1st M events during the time interval, then ignore
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# events for the rest of the time interval.
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#
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# 2) Threshold
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# Alert every M times we see this event during the time interval.
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#
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# 3) Both
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# Alert once per time interval after seeing M occurrences of the
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# event, then ignore any additional events during the time interval.
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#
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# Threshold commands are formatted as:
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#
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# event_filter gen_id gen-id, sig_id sig-id, \
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# type limit|threshold|both, track by_src|by_dst, \
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# count n , seconds m
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#
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# Limit to logging 1 event per 60 seconds:
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#
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# event_filter gen_id 1, sig_id 1851, type limit, \
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# track by_src, count 1, seconds 60
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#
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# Global Threshold - Limit to logging 1 event per 60 seconds per IP triggering
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# each rule (rules are gen_id 1):
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#
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# event_filter gen_id 1, sig_id 0, type limit, track by_src, count 1, seconds 60
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#
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# Global Threshold - Limit to logging 1 event per 60 seconds per IP triggering
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# any alert for any event generator:
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#
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# event_filter gen_id 0, sig_id 0, type limit, track by_src, count 1, seconds 60
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#
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# Suppression:
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#
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# Suppression commands are standalone commands that reference generators and
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# sids and IP addresses via a CIDR block (or IP list). This allows a rule to be
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# completely suppressed, or suppressed when the causitive traffic is going to
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# or comming from a specific IP or group of IP addresses.
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#
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# Suppress this event completely:
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#
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# suppress gen_id 1, sig_id 1852
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#
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# Suppress this event from this IP:
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#
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# suppress gen_id 1, sig_id 1852, track by_src, ip 10.1.1.54
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#
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# Suppress this event to this CIDR block:
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#
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# suppress gen_id 1, sig_id 1852, track by_dst, ip 10.1.1.0/24
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#
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# working example from iggbsd2 snort:
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#suppress gen_id 122, sig_id 17, track by_src, ip 172.16.0.2
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