Network Intf Error Critical

Rule ID

PH_Rule_Perf_216

Default Status

Enabled

Description

Detects that a network device interface errors has reached a critical level (greater than 5% based on 2 successive readings in a 10 minute interval

Severity

MITRE ATT&CK® Tactics

Interface

MITRE ATT&CK® Techniques

No Technique Specified

Impacts

Network

Data Source

Any Device via SNMP

Detection

Correlation

Remediation Guidance

Identify the root cause of the network packet error issue.

Time Window

If the following pattern or patterns match an ingested event within the given time window in seconds, trigger an incident.

600 seconds

Trigger Conditions

If the following defined pattern/s occur within a 600 second time window.

IntfErrorCrit

SubPattern Definitions

SubPattern Name: IntfErrorCrit

This is the named definition of the event query, this is important if multiple subpatterns are defined to distinguish them.

SubPattern Query

This is the query logic that matches incoming events

eventType = "PH_DEV_MON_NET_INTF_UTIL" AND hostIpAddr IN (Group@PH_SYS_DEVICE_Network)

Group by Attributes

This defines how matching events are aggregated, only events with the same matching attribute values are grouped into one unique incident ID

hostIpAddr,hostName,intfName

Aggregate Constraint

This is most typically a numerical constraint that defines when the rule should trigger an incident

(AVG(inIntfPktErrPct) > DeviceToCMDBAttr(hostIpAddr,intfName,IntfErrPctThreshCrit) OR AVG(outIntfPktErrPct) > DeviceToCMDBAttr(hostIpAddr,intfName,IntfErrPctThreshCrit)) AND COUNT(*) >= 2

Incident Attribute Mapping

This section defines which fields in matching raw events should be mapped to the incident attributes in the resulting incident.

The available raw event attributes to map are limited to the group by attributes and the aggregate event constraint fields for each subpattern

 hostIpAddr = IntfErrorCrit.hostIpAddr,
 hostName = IntfErrorCrit.hostName,
 intfName = IntfErrorCrit.intfName,
 inIntfPktErrPct = IntfErrorCrit.AVG(inIntfPktErrPct),
 outIntfPktErrPct = IntfErrorCrit.AVG(outIntfPktErrPct)

FortiSIEM Rules