TCP Retransmissions Due to Network Saturation

TCP retransmissions increased due to network saturation, leading to degraded pod-to-pod communication.

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What Happened

Pods in the cluster started experiencing increased latency and timeouts, which was traced back to TCP retransmissions caused by network saturation.

Diagnosis Steps

1Analyzed network performance using tcpdump and found retransmissions occurring during periods of high traffic.
2Verified that there was no hardware failure, but network bandwidth was fully utilized.

Root Cause

Insufficient network bandwidth during high traffic periods.

Fix/Workaround

• Increased network bandwidth allocation for the cluster.
• Implemented QoS policies to prioritize critical traffic.

Lessons Learned

Network saturation can severely affect pod communication, especially under heavy loads.

How to Avoid

1Use quality-of-service (QoS) and bandwidth throttling to prevent network saturation.
2Regularly monitor network bandwidth and adjust scaling policies to meet traffic demands.