docs(ec2): document Network ACL usage and default NACL workaround#37374
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syukawa-gh wants to merge 1 commit intoaws:mainfrom
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docs(ec2): document Network ACL usage and default NACL workaround#37374syukawa-gh wants to merge 1 commit intoaws:mainfrom
syukawa-gh wants to merge 1 commit intoaws:mainfrom
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The default Network ACL created with a VPC allows all inbound and outbound traffic (rule 100), and CDK does not manage it. Users cannot remove or modify these permissive rules through CDK. Add a Network ACLs section to the README documenting: - How to create a custom Network ACL and associate it with subnets - How to work around the default NACL's permissive rules by replacing it with a custom NACL that only allows specific traffic Closes aws#13220
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Issue
Closes #13220
Reason for this change
When a VPC is created, AWS automatically creates a default Network ACL with rule 100 that allows all inbound and outbound traffic. CDK does not manage the default Network ACL, so users cannot remove or modify these permissive rules through CDK. This was not documented, causing confusion.
Description of changes
Added a "Network ACLs" section to the
aws-ec2README documenting:Description of how you validated changes
Documentation-only change. Code examples use existing public API symbols (
NetworkAcl,AclCidr,AclTraffic,TrafficDirection,Action).Checklist