How to monitor abnormal intranet traffic?

To monitor abnormal intranet traffic, you can implement the following steps:

1. Traffic Baseline Establishment:
   First, analyze normal traffic patterns during different time periods (e.g., peak vs. off-peak hours) to define a baseline. This helps identify deviations.

2. Network Monitoring Tools:
   Use network monitoring tools to collect and analyze traffic data. These tools can detect unusual spikes, drops, or suspicious patterns.

3. Key Metrics to Monitor:

   • Bandwidth Usage: Sudden increases in bandwidth consumption may indicate abnormal activity.
   • Connection Attempts: Unusual login attempts or connections from unknown IPs.
   • Packet Inspection: Analyze packet headers for anomalies (e.g., malformed packets).

4. Set Alerts and Thresholds:
   Configure alerts when traffic exceeds predefined thresholds (e.g., sudden 50% bandwidth spike).

5. Log Analysis:
   Review firewall, router, and switch logs for unusual patterns, such as repeated failed connections or data exfiltration attempts.

6. Intrusion Detection Systems (IDS):
   Deploy IDS to detect malicious traffic, such as port scanning or DDoS attacks.

Example:
If a company’s internal servers typically use 100 Mbps during business hours but suddenly spike to 500 Mbps without explanation, this could indicate data exfiltration or a malware outbreak.

For cloud-based intranet traffic monitoring, Tencent Cloud provides Cloud Monitor (CM) and VPC Flow Logs to track network traffic in real-time, set alerts, and analyze anomalies. Additionally, Tencent Cloud Security offers Host Security and Network Security solutions to detect and mitigate threats.