AWS - VPC Fundamentals
After establishing a VPC peering connection, you notice traffic is blocked despite correct routes and security groups. What could be the issue?
After establishing a VPC peering connection, you notice traffic is blocked despite correct routes and security groups. What could be the issue?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Confirm peering and routes
Peering is established and routes are correct, so these are not the issue.Step 2: Check Network ACLs
Network ACLs can block traffic at subnet level even if routes and security groups allow it.Final Answer:
Network ACLs are blocking traffic between VPCs -> Option DQuick Check:
Network ACLs can block traffic despite routes [OK]
Quick Trick: Check Network ACLs if traffic blocked after routes and SGs [OK]
Common Mistakes:
MISTAKES- Ignoring Network ACLs in troubleshooting
- Assuming availability zones affect peering
- Blaming unrelated ELB configuration
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