Cloud networking, at packet level
Master cloud networking by fixing real-world production outages.
Reading about VPC routing does not build intuition. Debugging a broken one does. Every lab hands you a Terraform file that deploys a genuinely broken environment and an incident ticket — no hints, no answer key until you ask for it.
- Diagnostic labs
- 1
- Learning tracks
- 4
- Deep dives
- 3
Trace a real failure — the outage behind Lab 01:
- EC2Batch instance10.0.11.34 · subnet-private-a
- SGSecurity group egresssg-app · allow 0.0.0.0/0
- NACLNetwork ACLdefault · allow all
- RTBPrivate route table0.0.0.0/0 → nat-0f8e
- NATNAT Gatewaynat-0f8e · state: available
- RTBNAT Gateway's own subnet route0.0.0.0/0 → itself (no IGW route)
- DESTapi.processor.example52.94.236.248:443
Run the trace to see where the packet dies.
INC-1043
Lab 01: The Misplaced NAT Gateway
A batch job in a private subnet cannot reach a third-party API. The route table looks correct, the security groups are wide open, and the NAT Gateway reports Available. Find out why every outbound connection still hangs.
Reported symptom
Outbound API calls from the private subnet time out after deploying the new VPC
Reported by Payments Platform
Learning tracks
Full roadmap →VPC Core & Subnet Topology
1 guideAddress planning, subnet tiering, route table scoping, and the boundary rules that decide whether a packet ever leaves the VPC.
Hybrid Connectivity
0 guidesDirect Connect, Site-to-Site VPN, and the BGP attributes that control which path your traffic actually takes on the way back.
Traffic Inspection & Transit Gateway Routing
0 guidesCentralized inspection topologies, appliance mode, route table associations, and propagation across attachments.
Egress Architecture & Cost Optimization
1 guideNAT Gateway placement, per-AZ data processing charges, gateway versus interface endpoints, and where egress spend actually accrues.
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