NC2 Console:The NC2 console is specifically designed for deploying and managing Nutanix clusters on Azure. It provides the necessary tools and interface to configure, monitor, and manage the NC2 clusters effectively.

Cluster Deployment:Using the NC2 console ensures that all configurations and integrations with Azure are correctly handled, providing a seamless deployment experience.

References:

Nutanix NC2 Deployment Guide

Nutanix Console Documentation

Azure Directory Service Role: Azure Directory Service must be able to resolve specific Nutanix URLs to ensure proper communication and functionality during the deployment of an NC2 cluster.

Critical Endpoint: The address "Gateway-external-api.cloud.nutanix.com" is critical for establishing external API communications required for the deployment and management of the NC2 cluster.

DNS Resolution: Proper DNS resolution of this address ensures that the Azure Directory Service can interact with Nutanix services and APIs necessary for cluster operations.

Verification Process:

Ensure that DNS settings allow resolution of "Gateway-external-api.cloud.nutanix.com".

Test connectivity and resolution prior to deployment to avoid issues.

Importance: Without resolving this address, the deployment process might face connectivity issues, leading to potential deployment failures.

References:

Nutanix NC2 on Azure Setup Guide

Azure Active Directory Integration

Valid CIDR Range:When deploying an NC2 cloud cluster in Azure, a valid CIDR range is necessary to define the IP address space for the cluster and its associated networks. This range ensures that there are no conflicts with existing network configurations and provides sufficient addresses for the cluster resources.

My Nutanix Account:A my.nutanix.com account is required to access Nutanix services and manage NC2 deployments. This account allows administrators to log in, configure settings, and manage their Nutanix environment on Azure.

References:

Nutanix NC2 on Azure Deployment Guide

Azure Virtual Network Documentation

In this scenario, the issue arises from overlapping IP address ranges between the Transit VPC and the User VPC. Here’s a detailed breakdown:

Understanding ERPs (Elastic Routing Prefixes):

The ERP for the Transit VPC is 10.1.1.0/25, which covers IP addresses from 10.1.1.0 to 10.1.1.127.

The ERP for the User VPC is 10.1.1.0/24, which covers IP addresses from 10.1.1.0 to 10.1.1.255.

IP Address Overlap:

Since 10.1.1.0/25 is a subset of 10.1.1.0/24, there is a significant overlap in the IP address ranges of these two ERPs.

This overlap can cause routing issues because the same IP address range is being used in both VPCs, leading to ambiguity in routing and communication.

Communication Issue:

When a VM in the User VPC tries to communicate with other resources, the network cannot accurately determine the correct route due to the overlapping IP address ranges.

This overlap prevents proper routing and results in the VM being unable to communicate with other resources as intended.

Resolution:

To resolve this issue, the ERPs must be in different CIDR ranges. This means the IP address ranges for the Transit VPC and the User VPC should not overlap.

For example, if the Transit VPC uses 10.1.1.0/25, the User VPC could use a different range such as 10.1.2.0/24 or any other range that does not overlap with 10.1.1.0/25.

By ensuring that the ERPs are in different CIDR ranges, the network can properly route traffic between the VPCs without any conflicts or ambiguities, thereby enabling the VM in the User VPC to communicate with other resources effectively.

Azure Resource Providers: To prepare an Azure subscription for NC2, specific resource providers must be registered to enable necessary services and resources.

Required Providers:

Microsoft.Network: This provider is essential for networking functionalities, including virtual networks, subnets, and other network resources necessary for NC2 deployment.

Microsoft.Nutanix: This provider is specifically required for integrating and managing Nutanix resources within the Azure environment.

Other Providers:

Microsoft.HybridNetworkandMicrosoft.HybridCompute: These are not specifically required for NC2 but might be relevant for other hybrid or extended network configurations.

Conclusion: Registering both "Microsoft.Network" and "Microsoft.Nutanix" ensures that all necessary network and Nutanix-specific resources are available for NC2 deployment.

References:

Azure Resource Providers Documentation

Nutanix on Azure Setup Guide

Default Route for Internet Traffic:By setting the default route of 0.0.0.0/0 for the Nutanix User VPC pointing to the external-NAT network, all internet-bound traffic from the desktops will be routed through the Azure NAT Gateway, conserving bandwidth on the ExpressRoute connection.

On-Premises Route:Setting a specific route to the on-premises subnet for the Nutanix User VPC pointing to the external-No-NAT network ensures that traffic destined for on-premises resources bypasses the NAT Gateway and utilizes the ExpressRoute connection, optimizing the use of network paths.

References:

Azure NAT Gateway Documentation

Nutanix NC2 Networking Configuration Guide

Floating IP Address Limitation:The cluster already has 25 floating IP addresses in use by other VMs. If the administrator cannot assign a floating IP address to the new VM, it is because the pool of available floating IPs is exhausted.

Requesting Additional Floating IPs:To resolve this issue, the administrator needs to request additional floating IP addresses to be allocated to the NAT subnet. This will ensure that there are enough IP addresses available for all VMs requiring inbound connectivity.

References:

Nutanix Networking Configuration Guide

Azure IP Address Management Documentation