VM with two NICs

You can still separate management and application traffic securely using these approaches:

1. Use Subnets Within the Same VNet

• Create VNet-A with:
• Subnet-1 for application traffic
• Subnet-2 for management traffic
• Attach each NIC to a different subnet
• Apply Network Security Groups (NSGs) to isolate traffic

2. Use VNet Peering

• Keep VNet-A and VNet-B separate
• Peer them together
• Deploy a network virtual appliance (NVA) or firewall to route and inspect traffic between NICs

3. Use Azure Firewall or NVA

• Insert a firewall between subnets or VNets
• Control traffic flow with rules and route tables
• This gives you granular control over what management traffic can reach application VMs

4. Use Private Endpoints or Bastion

• For management access, use Azure Bastion or Private Endpoints
• Avoid direct NIC exposure and reduce attack surface