Regional virtual network integration is now generally available in the Azure Functions Premium plan. Run serverless function apps with no cold-start, virtual network connectivity and larger instance sizes with the Premium plan. The general availability of regional virtual network integration also brings these features:

The ability to direct all traffic leaving an application into the virtual network.
Support for applying user-defined routes and network security groups to the integrated application.
Support for reaching private link-secured resources through a regional virtual network integration.
Support for non-RFC 1918 addresses in an integrated virtual network.

Regional virtual network integration is available in all public regions for function apps hosted on the Premium and App Service plan running on Windows. Regional virtual network integration for Linux is currently in preview.

Learn more about the Premium plan.

Learn more about Functions support for regional virtual network integration.

Read more about regional virtual network integration.