VPC flow logs can be helpful in diagnosing network issues between EC2 instances. Some things to look for in the flow logs include:

 rejected traffic - This could indicate issues with security group or network ACL rules
 high latency or packet loss - This could indicate network congestion or other performance issues
 traffic to/from unexpected IP addresses or ports - This could indicate security issues like unauthorized access attempts
 uneven traffic distribution - This could indicate imbalance in your architecture that can affect performance
 drops in traffic - This could indicate issues with your instances or network
 spikes in traffic - This could help you identify peak usage times or potential bottlenecks

Analyzing the flow log data can help you pinpoint the cause of communication issues between your EC2 instances. The logs provide a detailed view of the network traffic in your VPC which can be useful for troubleshooting.
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