Classless Inter-Domain Routing (CIDR) is a way to describe an IP address range using a notation such as /21. For example, 10.20.0.0/21 represents a block of IP addresses used inside your virtual network.
CIDR blocks define:
- Your VNet (Virtual Network) address space
- The AKS subnet where Azure Kubernetes Service (AKS) resources run
Who Does What?
| Step | Responsible | Action |
|---|---|---|
| 1 | Teradata CloudOps team | Requests the required Azure network range from the customer network team. |
| 2 | Customer Network team | Allocates and approves the CIDR block based on internal IP plan and existing routes. |
| 3 | Teradata Network team/Customer Network team | Depending on the network connectivity model (VNet peering or VPN), the Teradata Network team works with the Customer Network team to resynchronize connectivity after the address space is added. |
| 4 | Customer Administrator | Shares the approved CIDR block with Teradata CloudOps team. |
| 5 | Teradata CloudOps team | Validates the CIDR block for overlaps and AKS restrictions and then proceeds with provisioning and configuration. |
Minimum CIDR Requirement
- The AKS subnet must use a /21 CIDR block that contains 2,048 IP addresses.
Restrictions
You must not use the following CIDR blocks:
- AKS restricted ranges
- 169.254.0.0/16
- 172.30.0.0/16
- 172.31.0.0/16
- 192.0.2.0/24
- Teradata-specific restricted ranges
- 100.64.0.0/10
- 10.255.0.0/16
- 172.31.0.0/16