Understanding how IP addressing is split between internal local networks and the global internet is vital for network design, firewall configuration, and threat analysis.
Here is the structural breakdown:
🏠 Private IP Addresses: Non-routable addresses assigned to devices within a Local Area Network (LAN). They are free to use, repeatable across different private networks, and managed locally (e.g., home or corporate subnets).
🌍 Public IP Addresses: Globally unique, routable addresses assigned by an Internet Service Provider (ISP) that identify devices directly on the public internet (WAN).
🔄 NAT (Network Address Translation): The mechanism that enables multiple local devices sharing a single private IP space to communicate externally by translating source addresses at the gateway router.
Expert Insight: In infrastructure security, distinguishing between internal private subnets and external public-facing perimeters is crucial. Misconfigured network address translations or exposed private services can easily lead to critical security vulnerabilities.
How do you structure your internal VLANs and NAT gateways in cloud or on-prem environments? Let's discuss in the comments below! 👇