07. Route Table - Traffic Control

Route Table

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Prerequisites

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1. Route Table

Route Table is a core networking component in AWS. It defines Where network traffic should go

A Route Table is:

• A set of rules (routes)
• Used to control traffic flow inside a VPC

👉 Think of it as:

A navigation system for network traffic

Each route consists of:

• Destination (CIDR)
• Target (where traffic goes)

2. How to work Route Table

Destination     Target
10.0.0.0/16     local
0.0.0.0/0       IGW

• 10.0.0.0/16 → local → Internal VPC communication

• 0.0.0.0/0 → IGW → Internet traffic goes to Internet Gateway

2-1. Subnet

Route Tables are associated with subnets. Subnet determines which route table is used.

Subnet is public or private based on its route table

Public Subnet

• Has route:

0.0.0.0/0 → IGW

👉 Internet accessible

Private Subnet

• No route to IGW

👉 No direct internet access

2-2. Route Targets

Common targets:

Target	Description
local	Internal VPC communication
IGW	Internet Gateway
NAT Gateway	Private subnet internet access
VPC Peering	Communication between VPCs

3. How to create Route Table

3-1. Search VPC

3-2. Click Navigation pane → “Route tables”

3-3. Click Button → “Create route table”

3-4. Route table settings

3-5. Step 1. Edit subnet associations

3-6. Step 2. Add Public subnet

3-7. Step 3. Edit routes

3-8. Step 4. Arrange routes

4. Related Concepts

• Components
  • VPC
  • Subnet
  • Internet Gateway
  • Nat Gateway