A Network Interface (NIC) is an interconnection between a Virtual Machine and the underlying software network. An Azure Virtual Machine (VM) has one or more network interfaces (NIC) attached to it. Any NIC can have one or more static or dynamic public and private IP addresses assigned to it.

Configuring the network interface

Virtual network & subnets: we can attach a network interface to a VNet and Subnet, and once we deployed a NIC into a VNet, we can’t change it.

IP configuration: Public and private IP addresses will be assigned at the NIC level. Primary & secondary IP configurations

NSG & Routes: We can apply zero or one network security group and one or more routes to a network interface.

IP Forwarding: This setting must be enabled for every network interface that is attached to the virtual machine.

DNS servers- We can specify which DNS server the Azure DHCP servers assign a network interface.

Hostname resolution

We can specify a DNS domain name label for a public IP resource, which creates a mapping for domainnamelabel.location.cloudapp.azure.com to the public IP address in the Azure-managed DNS servers.

Internal DNS hostname resolution (for VMs)

All Azure VM’s are configured with Azure-managed DNS servers by default unless you want to set custom DNS servers explicitly, and these Azure managed DNS servers provide internal name resolution for VM’s that reside with the same VNet. So if we want to RDP from one virtual machine to another virtual machine, you actually can use the name of the machine in stuff Private IP address.

Configure multiple NICs and IP addresses for a VM

Step 1: Click on Create resource button and type-in network interface. Then click on Network Interface and create.

Step 2: Now, fill the required details and click on create.

Step 3: Your Network Interface will be created and ready to embed.

Step 4: Again, go to the home page and create a public IP address.

Step 5: Now, fill the required details and click on create.

Step 6: You have now both the NIC and IP address ready to use with the virtual machine.

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