Using private NAT for networks with overlapping IP spaces

Running AI workloads in a hybrid fashion — in your data center and in the cloud — requires sophisticated, global networks that unify cloud and on-premises resources. While Google’s Cloud WAN provides the necessary unified network fabric to connect VPCs, data centers, and specialized hardware, this very interconnectedness exposes a critical, foundational challenge: IP address scarcity and overlapping subnets. As enterprises unify their private and cloud environments, manually resolving these pervasive address conflicts can be a big operational burden.

Resolving IPv4 address conflicts has been a longstanding challenge in networking. And now, with a growing number of IP-intensive workloads and applications, customers face the crucial question of how to ensure sufficient IP addresses for their deployments.

Google Cloud offers various solutions to address private IP address challenges and facilitate communication between non-routable networks, including Private Service Connect (PSC), IPv6 addressing, and network address translation (NAT) appliances. In this post, we focus ...