[[["わかりやすい","easyToUnderstand","thumb-up"],["問題の解決に役立った","solvedMyProblem","thumb-up"],["その他","otherUp","thumb-up"]],[["わかりにくい","hardToUnderstand","thumb-down"],["情報またはサンプルコードが不正確","incorrectInformationOrSampleCode","thumb-down"],["必要な情報 / サンプルがない","missingTheInformationSamplesINeed","thumb-down"],["翻訳に関する問題","translationIssue","thumb-down"],["その他","otherDown","thumb-down"]],["最終更新日 2025-09-01 UTC。"],[],[],null,["# Network connectivity for heterogeneous Oracle to Cloud SQL for PostgreSQL migrations\n\nThis page provides an overview of concepts associated with configuring\nnetwork connectivity for heterogeneous Oracle to\nCloud SQL for PostgreSQL migrations:\n\n- [Network components](#overview) describes how the source and destination\n connectivity make up the end-to-end network configuration for migrations.\n\n- The examples sections show different combinations for public and private\n source and destination connectivity:\n\n - [Public IP source connectivity and private IP destination connectivity](#example-public-src-private-dst)\n\n - [Private IP source connectivity and public IP destination connectivity](#example-private-src-outside-gcp)\n\nAfter you've considered the high-level relations between Google Cloud\nservices involved in the migration process, you can proceed to learn more about\n[source database connectivity methods](/database-migration/docs/oracle-to-postgresql/networking-methods-source) and\n[destination database connectivity methods](/database-migration/docs/oracle-to-postgresql/networking-methods-destination).\n\nNetwork components involved in the migration process\n----------------------------------------------------\n\nFrom a networking point of view, Database Migration Service and Cloud SQL are\n*service producers* that reside in their own dedicated networks\n(known as *service networks*), outside the Virtual Private Cloud (VPC)\nnetworks that you use in your Google Cloud project.\nThe goal of configuring network connectivity for a migration process with\nDatabase Migration Service is to ensure that Database Migration Service can reach your source\nOracle database server and the destination Cloud SQL for PostgreSQL\ninstance.\n[](#lightbox-trigger) **Figure 1.** Simplified view of heterogeneous migration networking (click to enlarge)\n\nWhen you plan the network connectivity setup for your migration, it's important\nto carefully consider the infrastructure requirements, including what limitations\nyour networking decisions might introduce to the end state of the migrated\ndatabase instance. For example, if you want to use a private connection\nfor the destination database connectivity, you need to create your destination\nCloud SQL instance with private IP enabled. You can't later disable the\nprivate IP on your Cloud SQL instance.\n\nThere are multiple different methods you can use to establish the necessary\nnetwork connections. Both\n[source](/database-migration/docs/oracle-to-postgresql/networking-methods-source) and\n[destination](/database-migration/docs/oracle-to-postgresql/networking-methods-destination) connectivity can be established with the use of public\nor private IP addresses. You can combine any source and destination connectivity\nmethods to best match your infrastructure requirements.\n\nExample: public IP source connectivity and private IP destination connectivity\n------------------------------------------------------------------------------\n\nIn this example, you have the following database instances:\n\n- A self-hosted source Oracle database server with a public IP address.\n- A Cloud SQL for PostgreSQL destination instance with a private IP address enabled.\n\n[](#lightbox-trigger) **Figure 2.** Migration networking example: public IP source connectivity with private IP destination connectivity (click to enlarge)\n\nFor the\n[source database connectivity](/database-migration/docs/oracle-to-postgresql/networking-methods-source), you use the\n[IP allowlist method](/database-migration/docs/oracle-to-postgresql/networking-methods-source#ip-allowlist) to establish a connection\nover the public internet. You secure this connection with an SSL/TLS certificate.\n\nFor the\n[destination database connectivity](/database-migration/docs/oracle-to-postgresql/networking-methods-destination), you use\n[Private Service Connect](/database-migration/docs/oracle-to-postgresql/networking-methods-destination#private-ip) to establish\na private connection over the Google Cloud network. This internal\nconnection is automatically encrypted by Database Migration Service.\n\nExample: private IP connectivity for source database hosted outside Google Cloud\n--------------------------------------------------------------------------------\n\n\u003cbr /\u003e\n\nIn this example, you have the following components:\n\n- An Oracle source instance hosted in another cloud and a VPN gateway\n- A Cloud VPN instance in your Google Cloud VPC\n- A Cloud SQL for PostgreSQL destination instance with a public IP address enabled\n\n[](#lightbox-trigger) **Figure 2.** Migration networking example: private IP source connectivity and public IP destination connectivity (click to enlarge)\n\n\u003cbr /\u003e\n\nFor the\n[source database connectivity](/database-migration/docs/oracle-to-postgresql/networking-methods-source), you use a\n[private connectivity configuration](/database-migration/docs/oracle-to-postgresql/networking-methods-source#private-connectivity-for-source) to establish a VPC peering\nconnection between Database Migration Service and the VPC where you have\nyour Cloud VPN instance. You use Cloud VPN to create\nan IPsec tunnel between Google Cloud and the cloud network where you have the\nsource Oracle database.\n\nFor the\n[destination database connectivity](/database-migration/docs/oracle-to-postgresql/networking-methods-destination), you use the\n[public IP connectivity method](/database-migration/docs/oracle-to-postgresql/networking-methods-destination#public-ip) to establish a connection\nover the public internet. Database Migration Service automatically secures this connection\nwith SSL/TLS.\n\nWhat's next\n-----------\n\nThere are many different connectivity methods you can use. Each method\ncan be further adjusted with proxy servers, ssh tunnels, and bastion VMs.\n\n- Learn more about [source database connectivity methods](/database-migration/docs/oracle-to-postgresql/networking-methods-source).\n- Learn more about [destination database connectivity methods](/database-migration/docs/oracle-to-postgresql/networking-methods-destination)."]]
