#Security Group
2 posts
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AWS VPC Edge Routing Guide Part 3: How Packets Actually Flow Inside a VPC — IGW, NAT Gateway, Route Tables, Security Group vs NACL
The four components (IGW, NAT GW, Route Table, SG vs NACL) that decide where packets go inside a VPC and where they get blocked. The real difference between Public and Private subnets, NAT Gateway mechanics, Route Table evaluation order, the decisive split between stateful and stateless firewalls, and the common anti-patterns. The final post in the AWS VPC Edge Routing Guide series.
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AWS Private EC2 Operations Guide Part 2: Building VPC Infrastructure with Terraform — VPC/Subnet/Route Table/SG/ALB/EC2 in a Single main.tf
Turn the Part 1 architecture into real code. We build a 10.0.0.0/16 VPC, 2AZ Public/Private subnets, IGW/NAT Gateway, the SG-references-SG pattern, and ALB + EC2 — all in one main.tf that comes up with a single terraform apply.