A company acquired a competitor; both have VPCs in AWS and those VPCs have overlapping IP address ranges. Both VPCs must access an AWS Marketplace partner service. Which approach ensures the VPC-hosted services and the Marketplace partner service can interoperate despite the overlap?

AWS PrivateLink is the correct solution because it allows private connectivity to services hosted in other VPCs without requiring VPC peering or exposing traffic to the public internet. PrivateLink uses interface endpoints (ENIs) with private IP addresses in your VPC, enabling communication with the partner service via DNS. This approach inherently bypasses IP address range overlap issues because traffic flows through AWS's internal network using private IP addresses assigned from your VPC, not directly between the overlapping CIDR blocks. VPC peering with static routes would fail due to the overlapping IP ranges. NAT gateways or instances are for outbound internet access or translating private IPs for public destinations, not for resolving overlapping private IP ranges between VPCs for internal service access. While Site-to-Site VPN could connect to the partner service, it doesn't solve the internal VPC overlap issue, and PrivateLink offers a more secure and simpler private connection.