Cross-premises virtual network

A cross-premises Azure virtual network:

• on-premises network is connected to Azure virtual network
• extending on-premises network to include subnets and virtual machines hosted in Azure infrastructure services
• lets computers on the on-premises network to directly access virtual machines in Azure and vice versa

Ways to create Cross-premises virtual network

• Site-to-Site VPN connection
• Express Route connection

Site-to-Site VPN connection

• Requires VPN router in on-premise network
• Requires VPN Gateway in Azure vNet
• Requires VPN connection (route based or policy based)
• Details: Azure Virtual Network - Site to site vpn connection

Express Route

• Requires VPN router with BGP (Border Gateway Protocol) support
• Third party vendor (ExpressRoute connection provider) is involved
• Requires ExpressRoute Gateway in Azure vNet
• Requires VPN connection (route based with BGP)
• Details: Azure Virtual Network - ExpressRoute connection