Google Cloud Hybrid Connectivity

  • There are several ways to extend your on-premises environment to the Google Cloud Platform.
  • You can connect your infrastructure to Google Cloud Platform (GCP) on your terms, from anywhere based on your requirements.

Cloud Interconnect

  • Provides low latency, highly available connections that enable you to reliably transfer data between your on-premises and Google Cloud VPCs.
  • Cloud Interconnect connections provide internal IP address communication, which means internal IP addresses are directly accessible from both networks.
  • Cloud Interconnect offers two options to extend your on-premises network to the Google Cloud Platform:
    • Dedicated Interconnect
      • Direct physical Connection to Google’s network.
    • Partner Interconnect
      • Provides connectivity through a supported service provider.
    • You can use Cloud Interconnect in combination with Private Google Access for on-premises resources so that your on-premises resources can use internal IP addresses rather than external IP addresses to reach Google APIs and services.
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Direct Peering

  • Direct Peering connects your on-premises network to Google services, including Google Cloud products that can be exposed via one or more public IP addresses.
  • Traffic from Google’s network to your on-premises network also takes that same connection, including traffic from VPC networks in your projects.
  • Direct Peering exists outside of Google Cloud Platform. So, unless you need to access Google Workspace applications, the recommended methods of access to Google Cloud Platform are via Dedicated Interconnect or Partner Interconnect.

Cloud VPN

  • Cloud VPN securely extends your peer network to Google’s network through an IPsec VPN tunnel.
  • Ipsec VPN tunnels encrypt data by using industry-standard Ipsec protocols as traffic traverses the public Internet.
  • It only requires a VPN device in your on-premises network, unlike Cloud Interconnect that comes with overhead and costs to set up a direct private connection.
  • Cloud VPN pricing is based on the location of the Cloud VPN gateway and the number of tunnels per hour.

References:
https://cloud.google.com/hybrid-connectivity
https://cloud.google.com/network-connectivity/docs/interconnect/concepts/overview
https://cloud.google.com/network-connectivity/docs/vpn/concepts/overview
https://cloud.google.com/network-connectivity/docs/direct-peering

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