What's New in SDN for Windows Server 2019

Applies to: Windows Server 2022, Windows Server 2019, Windows Server (Semi-Annual Channel)

Feature	Description	New/updated
Encrypted networks	Virtual network encryption allows encryption of virtual network traffic between virtual machines that communicate with each other within subnets marked as ‘Encryption Enabled.' It also utilizes Datagram Transport Layer Security (DTLS) on the virtual subnet to encrypt packets. DTLS protects against eavesdropping, tampering, and forgery by anyone with access to the physical network.	New
Firewall auditing	Firewall auditing is a new capability for the SDN firewall in Windows Server 2019. When you enable SDN firewall, any flow processed by SDN firewall rules (ACLs) that have logging enabled gets recorded.	New
Virtual network peering	Virtual network peering lets you connect two virtual networks seamlessly. Once peered, for connectivity purposes, the virtual networks appear as one.	New
Egress metering	This new feature in Windows Server 2019 enables SDN to offer usage meters for outbound data transfers. With this feature added, Network Controller keeps an allowlist per Virtual Network of all IP ranges used within SDN, and consider any packet bound for a destination that is not included in one of these ranges to be billed outbound data transfers.	New

---