Azure Hybrid Connectivity Blueprint

Connect on-premises networks to Azure with secure, governed, and scalable design — using VPN/ExpressRoute, Azure Firewall, Bastion, Private Endpoints, and Private DNS.

Overview (Problem Solved)

Many organizations need reliable, secure connectivity between their on-prem data centers and Azure workloads. This blueprint solves for:

Private, encrypted connectivity from on-prem to Azure via VPN Gateway (with optional ExpressRoute).
Controlled egress and inspection with Azure Firewall and user-defined routes (UDRs).
Zero public exposure for PaaS services using Private Endpoints and Private DNS Zones.
Secure admin access via Azure Bastion (no public RDP/SSH).
Governance, monitoring, and identity with Entra ID (PIM), Policies, and Azure Monitor.

Diagram

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Design Principles

Defense in depth: Internet ingress via Application Gateway (WAF), east-west and egress controlled by Azure Firewall.
Least privilege: Entra ID + Privileged Identity Management (PIM); RBAC scoped to resource groups and subnets.
Private by default: PaaS access through Private Endpoints with Private DNS Zones for name resolution.
Separation of concerns: Dedicated subnets (GatewaySubnet, AzureFirewallSubnet, App, Data); UDRs to steer traffic.
High availability: Zone-redundant gateways where available; paired regions strategy for DR.
Observability: Azure Monitor, Log Analytics, and Insights on critical components; activity logs to a central workspace.
Cost control: Right-size gateways, leverage Standard vs Premium firewall tiers as needed; tag resources for allocation.
Compliance & policy: Management Group-level Azure Policies and Initiatives to enforce configuration baselines.

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