AWS NAT Gateway Explained — How Private Servers Reach the Internet
Your private EC2 instances have no public IP — so how do they download updates or call external APIs without being exposed to the internet? That's exactly what a NAT Gateway does. This in-depth, beginner-friendly walkthrough explains what a NAT Gateway is, how it works, how source-IP translation happens, how it differs from an Internet Gateway, and when you actually need one.
In this video:
• What a NAT Gateway is and the problem it solves
• The architecture: private subnet → NAT Gateway → Internet Gateway → internet
• Outbound vs inbound, and how route tables wire it up
• How source-IP translation works
• NAT Gateway vs Internet Gateway, side by side
• A real-world example, when to use it, and the cost gotchas to remember
⏱️ Chapters
0:00 Intro
0:44 What is a NAT Gateway?
2:24 Why you need it
4:14 The architecture
6:01 Route tables
7:51 Source IP translation
8:51 NAT Gateway vs Internet Gateway
10:22 When to use it
12:30 Real-world example
14:09 Things to remember
15:04 Summary
16:23 Thanks for watching
👍 Part of an AWS networking series — Elastic IP, NAT Gateway, and Internet Gateway. Like & subscribe for a new tech explainer every week on Kiran Tech AI.
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