VNet Peering connects separate virtual networks directly, allowing resources in one network to communicate with resources in another. Traffic flows entirely over the private Azure backbone network, which means it never travels across the public internet. This connection type provides high bandwidth and extremely low latency because it behaves like a single, unified network. You can set up peering across different subscriptions and regions, though you must ensure that the IP address spaces of the connected networks do not overlap.
An Azure VPN Gateway connects virtual networks to other virtual networks or to on-premises environments by using encrypted traffic tunnels. To secure data transit, the gateway establishes connections over the public internet or private lines using standard IPsec/IKE protocols. You can configure a site-to-site VPN to link an entire office building to Azure, or a point-to-site VPN to connect individual employee devices. For high-availability scenarios, a VPN gateway can act as a backup path alongside an ExpressRoute circuit, ensuring that traffic still flows if the primary private line fails.
Choosing between these two connectivity methods depends on your network design, latency limits, and security rules. You should evaluate the following criteria to determine the best path for your data:
A decision tree that branches based on whether the connection is cloud-only or hybrid, leading to choices between VNet peering, VPN Gateway types, and a combined hub-and-spoke topology.
To control how traffic moves through these networks, you can use Border Gateway Protocol (BGP) to automatically share routing paths across connections. When you need to override the default paths, you can implement custom route tables, also known as User-Defined Routes, to force traffic through specific security appliances before it reaches its final destination. This combination of dynamic and static routing ensures your network can automatically adapt to link failures while maintaining strict path security.
Both connectivity methods require strong access controls to protect network boundaries from unauthorized access. You can apply Network Security Groups (NSGs) to subnets or individual network interfaces to filter the inbound and outbound traffic passing through the peering or gateway connection. These groups act as distributed firewalls, validating every packet against a set of security rules before allowing it to pass. By isolating sensitive resources in their own subnets and strictly limiting the allowed traffic paths, you can enforce a zero-trust model across your entire hybrid network.
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Virtual Network Peering connects separate virtual networks directly, allowing resources in one network to communicate with resources in another. Traffic flows entirely over the private Azure backbone network, which means it never travels across the public internet. This connection type provides high bandwidth and extremely low latency because it behaves like a single, unified network.
Choose VNet Peering when you require the highest possible speed and lowest latency for communication within the cloud. Choose a VPN Gateway when you must connect a physical on-premises datacenter or need to encrypt data in transit over a public network path. Use both when building a hub-and-spoke topology where a central hub contains the gateway and spokes connect via peering.
VNet Peering connects virtual networks directly over Azure's private backbone, offering high bandwidth and low latency without crossing the internet. VPN Gateway connects virtual networks to other networks or on-premises environments using encrypted traffic tunnels over the public internet or private lines using IPsec/IKE protocols.
Network Security Groups (NSGs) can be applied to subnets or individual network interfaces to filter the inbound and outbound traffic passing through the peering or gateway connection. These groups act as distributed firewalls, validating every packet against a set of security rules before allowing it to pass, enabling enforcement of a zero-trust model across the network.
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