Managing IP Addresses with Azure Region Peering

Managing IP ranges effectively between peered regions is essential to ensure seamless connectivity, avoid conflicts, and maintain a scalable network infrastructure. Here’s a strategy for managing IP ranges between peered Azure regions.

Plan your IP address space

Begin by carefully planning your IP address space for each virtual network in the peered regions. Choose non-overlapping private IP address ranges (based on RFC 1918) for each virtual network to prevent conflicts.

* For example, you can use the following CIDR blocks for your virtual networks:
    * Region A: 10.1.0.0/16
    * Region B: 10.2.0.0/16

Subnet allocation

Divide each virtual network’s IP address space into smaller subnets based on your application and service requirements. Allocate subnets for different purposes, such as web, application, and database tiers, ensuring that you leave room for growth.

* For example, in Region A:
    * Web Tier: 10.1.1.0/24
    * App Tier: 10.1.2.0/24
    * Database Tier: 10.1.3.0/24

Reserve IP ranges for future use

When designing your IP address spaces, reserve some IP ranges for future expansion. This will help you accommodate growth without reconfiguring your existing infrastructure.

Consistent naming and tagging

Use a consistent naming and tagging scheme for your virtual networks and subnets to make it easy to identify their purpose and location. This will help you manage your IP ranges more effectively.

Use IP address management (IPAM) tools like Efficient IP

Leverage IPAM tools, like Efficient IP, to track and manage your IP address allocations across peered regions.

Automate IP allocation

Use automation tools and scripts to allocate IP addresses for resources within your peered regions. This will help you maintain consistency and reduce the risk of errors and conflicts.

Monitor and audit IP address usage

Regularly monitor and audit your IP address usage across peered regions to identify any inconsistencies, conflicts, or wasted IP address space. Use Azure Monitor and Azure Log Analytics to collect and analyze IP address usage data.

Update and maintain IP address documentation

Keep your IP address documentation up to date, reflecting the current state of your IP address allocations across peered regions. This documentation will serve as a valuable reference for your network administrators and support teams.

Conclusion

In conclusion, Seagen has a process for allocating IP Ranges, CIDR, etc. Being consistent, thorough, and managing the process will make sure we don’t get behind or lose resources potentially causing outages or disruption to our environment.