Network Monitoring Custom Thresholds
- How to modify the network monitoring thresholds
What you are going to learn:
Users can tweak and mofiy the network monitoring thresholds with custom settings.
These custom thresholds can be configured in the
Advanced Parameters section of the Network Monitoring Template if the
Custom value is selected for the Threshold Presets option.
For the Packet Loss, Latency and Jitter thresholds, two severity levels are available: Warning and Error.
For the Session Timeout threshold (i.e. session is down), the severity level is always Critical.
The session timeout threshold is the number of seconds to wait until a
Session Down network issue is raised. This network issue is raised directly by both the agents (client and server), and never during the analysis of the measurements.
The packet loss thresholds are straightforward: if the packet loss for the 60-sec interval is higher than the threshold, a network issue is raised. Two thresholds are available, one for severity level warning and the other one for severity level error.
In the Network Monitoring Graphs, the color yellow is used for warning and red for errors.
Since the thresholds are configured on Network Monitoring Templates, it is not ideal to use absolute values because the latency between agents depends on multiple factors, such as the distance and the connection medium (DSL, Cable, Fiber, Wireless). This is why the thresholds are relative to the historical value, which is the median of the last 48 hours, updated every hour.
If the current value (latency or jitter) is higher by more than
X percent of the historical value, a network issue could be raised if the difference is a minimum of
The minimum difference is there to avoid network issues if the latency or jitter are very low. For example, a latency of
2ms between two offices connected with optical fiber that increases to
3ms, which is a 50% increase, is only 1ms increase. In that case, a minimum difference of
10ms, for example, would require the latency to increase to
12ms to raise a network issue.