Pod Network Partition Due to Misconfigured IPAM

Pod network partition occurred due to an incorrectly configured IP Address Management (IPAM) in the CNI plugin.

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What Happened

Pods were unable to communicate across nodes because the IPAM configuration was improperly set, causing an address space overlap.

Diagnosis Steps

1Inspected the CNI configuration and discovered overlapping IP address ranges.
2Verified network policies and found no conflicts, but the IP address allocation was incorrect.

Root Cause

Misconfiguration of IPAM settings in the CNI plugin.

Fix/Workaround

• Corrected the IPAM configuration to use non-overlapping IP address ranges.
• Redeployed the CNI plugin and restarted affected pods.

Lessons Learned

Carefully configure IPAM in CNI plugins to prevent network address conflicts.

How to Avoid

1Validate network configurations before deploying.
2Use automated checks to detect IP address conflicts in multi-node environments.