Internet Access – Recap

• NAT Gateway (IPv4 only, in public subnet)
• Allows private subnet IPv4 instances to access the internet
• Uses an Elastic IP (e.g., 198.51.100.1)
• Blocks unsolicited inbound traffic

• Internet Gateway (IPv4 + IPv6)
• Allows public subnet instances full two-way internet access
• Required for public IPv4 and public IPv6 connectivity

• Egress-only Internet Gateway (IPv6 only)
• Allows private subnet IPv6 instances outbound-only access
• Blocks inbound IPv6 connections initiated from the internet

Route Tables

Public Subnet

Private Subnet