Allocate Static CIDRs
Static CIDRs are fixed IP blocks that you assign to specific subnets or services. In the Azure portal, browse to your IP address pool, select Allocate under Settings, then click + Create and choose Allocate static CIDRs. You must enter a Name, a Description, and the CIDR block details. This process ensures that critical network segments always have predictable addressing, which is especially important when integrating on-premises and Azure VM networks.
Review Allocation Usage
Monitoring how your IP address space is used helps you plan for growth and avoid exhaustion. Navigate to your IP address pool and select Allocations under Settings. Examine statistics such as Pool address space, Allocated address space, and Available address space. These metrics show you how many addresses are already taken, how many remain, and whether you need to expand the pool or reclaim unused addresses.
Delegate Permissions for IP Address Management
Managing who can modify IP address pools is a security best practice. Go to the IP address pool settings, select Access control (IAM), and add role assignments using Azure RBAC. For example, assign the IPAM Pool User role to a team that needs to view or update allocations but should not change the overall pool structure. This keeps the configuration secure while still allowing delegated administration.
High Availability Configuration
To keep DHCP services running even during a failure, you need a high availability setup. In Azure, you can use Azure VMware Solution to create a DHCP server or relay. Define segments and configure subnets that consume the DHCP services. If needed, use NSX Manager to host the DHCP server directly. These steps ensure that IP addressing remains consistent and uninterrupted across both on-premises and Azure VM networks, providing resilience against single points of failure.
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