Network Segmentation Issues Due to Misconfigured CNI

Network segmentation between clusters failed due to incorrect CNI (Container Network Interface) plugin configuration.

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What Happened

The CNI plugin was incorrectly configured, allowing pods from different network segments to communicate, violating security requirements.

Diagnosis Steps

1Inspected kubectl describe node and found that nodes were assigned to multiple network segments.
2Used network monitoring tools to verify that pods in different segments were able to communicate.

Root Cause

The CNI plugin was not correctly segmented between networks, allowing unauthorized communication.

Fix/Workaround

• Reconfigured the CNI plugin to enforce correct network segmentation.
• Applied the changes and tested communication between pods from different segments.

Lessons Learned

Network segmentation configurations should be thoroughly reviewed to prevent unauthorized communication.

How to Avoid

1Implement strong isolation policies in the network plugin.
2Regularly audit network configurations and validate segmentation between clusters.

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