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Concepts

Understanding Multi-Cloud VPC Private Subnet Proxy Deployment

Andrios Robert

• 1 min read

### Understanding Multi-Cloud VPC Private Subnet Proxy Deployment A multi-cloud VPC private subnet proxy lets you route traffic securely across providers without exposing internal services to the public internet. In practice, it means AWS, GCP, and Azure can share controlled, encrypted paths between workloads, with each VPC protected inside private subnets. The proxy acts as the broker—handling connections, enforcing policy, and isolating systems from direct exposure.

Core Architecture

  1. Private Subnets in Each Cloud – Deploy applications inside private subnets of each VPC. No public IPs.
  2. Centralized Proxy Layer – Use a proxy endpoint that spans cloud regions via peering or VPN tunnels. This proxy has rules for inbound and outbound traffic, tied to IAM or equivalent role-based permissions.
  3. Secure Routing – Route inter-cloud traffic through the proxy gateway using private IPv4 space. Traffic never leaves encrypted tunnels.
  4. Failover and Redundancy – Deploy multiple proxy nodes in each VPC for load balancing and resilience against outages.

Deployment Steps

  • Provision VPC and Subnets in each cloud platform. Allocate CIDR ranges that do not overlap.
  • Establish Interconnects with VPN or private peering between each VPC.
  • Deploy Proxy Servers with persistent storage for configurations. Harden them using security groups and network ACLs.
  • Configure Routing Tables to direct traffic between subnets through proxy instances. Ensure routes are specific and deny direct public paths.
  • Monitor and Log all proxy connections. Use centralized logging in a secure bucket or instance isolated from production traffic.

Best Practices

  • Keep credentials and keys out of the proxy host filesystem.
  • Automate deployment scripts with Terraform or Pulumi for repeatability.
  • Apply least-privilege IAM roles to proxy processes.
  • Audit connection logs monthly and adjust firewall rules proactively.

A correctly deployed multi-cloud VPC private subnet proxy reduces attack surface, improves compliance posture, and delivers consistent inter-cloud connectivity. When tuned, it becomes invisible to end users but vital to your infrastructure.

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