Building AWS VPC functionality from scratch using Linux networking primitives.

• ✅ Create isolated VPCs with custom CIDR blocks
• ✅ Multiple subnets (public and private) per VPC
• ✅ NAT gateway for internet access
• ✅ VPC-level isolation
• ✅ Security groups (firewall rules)
• ✅ Complete lifecycle management

• Linux system (tested on Ubuntu/WSL2)
• Root/sudo access
• Python 3.x
• iproute2, iptables, bridge-utils

# Create a VPC
sudo ./vpcctl create-vpc myvpc 10.0.0.0/16

# Add public subnet (with NAT)
sudo ./vpcctl add-subnet myvpc web 10.0.1.0/24 --type public

# Add private subnet (no internet)
sudo ./vpcctl add-subnet myvpc db 10.0.2.0/24 --type private

# List VPCs
sudo ./vpcctl list

# Delete VPC
sudo ./vpcctl delete-vpc myvpc

VPC (10.0.0.0/16)
├── Bridge (br-myvpc) - 10.0.0.1/16
│   ├── Public Subnet (10.0.1.0/24) → NAT → Internet
│   └── Private Subnet (10.0.2.0/24) → Isolated

Run the complete test suite:

sudo ./quick-test.sh

sudo ./cleanup.sh

Nweke Henry Chukwudi