Troubleshooting Tip: Bandwidth utilization issues
Description
This article describes how to troubleshoot bandwidth issues and detect which host consumes the most bandwidth.
Scope
FortiGate.
Solution
To check the interface bandwidth utilization, go to Dashboard -> Status -> Add widget -> Interface Bandwidth -> Specify Interface -> Add widget.
The chart shows the selected interface's real-time incoming and outgoing traffic bandwidth.
Incoming (RX) and Outgoing (TX) Packets Per Second (PPS) on FortiGate interfaces can be monitored using the following CLI command:
diagnose netlink interface packet-rate
To check the highest bandwidth utilization by source, go to Dashboard -> FortiView Sources -> Sort by Bytes.
Ensure that logging is enabled on the firewall policies by going to Policy & Objects -> Firewall Policy -> Select Firewall policy -> Edit, enable logging by enabling Log allowed traffic.
Related documents:
Bandwidth utilization Issue using FortiGate and Akamai servers
Technical Tip: How to check interface bandwidth utilization from GUI