Configure network security groups and firewall rules to control inbound/outbound traffic and implement network segmentation.

Network Security Groups Table of Contents [Overview]( overview) [When to Use]( when to use) [Quick Start]( quick start) [Reference Guides]( reference guides) [Best Practices]( best practices) Overview Implement network security groups and firewall rules to enforce least privilege access, segment networks, and protect infrastructure from unauthorized access. When to Use Inbound traffic control Outbound traffic filtering Network segmentation Zero trust networking DDoS mitigation Database access restriction VPN access control Multi tier application security Quick Start Minimal working example: Reference Guides Detailed implementations in the references/ directory: Guide Contents [AWS Security Groups](references/aws security groups.md) AWS Security Groups [Kubernetes Network Policies](references/kubernetes network policies.md) Kubernetes Network Policies [GCP Firewall Rules](references/gcp firewall rules.md) GCP Firewall Rules [Security Group Management Script](references/security group management script.md) Security Group Management Script Best Practices ✅ DO Implement least privilege access Use security groups for segmentation Document rule purposes Regularly audit rules Separate inbound and outbound rules Use security group references Monitor rule changes Test access before enabling ❌ DON'T Allow 0.0.0.0/0 for databases Open all ports unnecessarily Mix environments in single SG Ignore egress rules Allow all protocols Forget to document rules Use single catch all rule Deploy without firewall

network-security-groups