AWS - Security Groups and Network ACLs
An outbound rule allows all traffic to 10.0.0.0/16 but the instance cannot reach 10.0.1.5. What is a possible cause?
An outbound rule allows all traffic to 10.0.0.0/16 but the instance cannot reach 10.0.1.5. What is a possible cause?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Confirm outbound rule covers 10.0.1.5
10.0.0.0/16 includes 10.0.1.5, so outbound rule is correct.Step 2: Check inbound rules
If inbound rules block traffic from 10.0.1.5, communication fails despite outbound allowance.Final Answer:
Inbound rules block traffic from 10.0.1.5 -> Option DQuick Check:
Inbound rules must allow return traffic from destination [OK]
Quick Trick: Inbound rules must allow traffic from destination IP [OK]
Common Mistakes:
- Assuming outbound rules alone control connectivity
- Ignoring inbound rule restrictions
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