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Learn how to configure Azure Kubernetes Service (AKS) external load balancers to accept traffic only from specific IP ranges using Calico's GlobalNetworkPolicy.
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How to Allow Traffic from Specific IP Ranges to AKS External Load Balancer

In today's cloud-native environments, managing traffic to your applications while ensuring security is paramount. If you're using Azure Kubernetes Service (AKS) and need to allow traffic from only specific IP ranges to your external load balancer, this post is for you. We’ll explore how to set up your network policies effectively using Calico.

Understanding the Problem

When you deploy applications on AKS, by default, external traffic can hit your services, often leading to potential security risks. The need arises to limit this access solely to trusted IP ranges. The solution involves configuring GlobalNetworkPolicy in Calico, which will control ingress traffic.

Here's a common scenario:

You want to create a policy that denies all incoming traffic to the load balancer and only allows access from a set of predefined IP ranges. If this is not functioning as expected in your setup, let’s step through the solution.

Step-by-Step Solution

1. Deny All Ingress Traffic

To begin with, you will need a GlobalNetworkPolicy that denies all ingress traffic. This acts as a blanket policy that secures your services. Here's how you can configure this policy:

[[See Video to Reveal this Text or Code Snippet]]

2. Allow Traffic from Specific IP Ranges

After setting up the deny policy, you can create a secondary policy that allows traffic from specific IP ranges. This allows you to maintain a secure environment while permitting access to trusted sources. Below is an example:

[[See Video to Reveal this Text or Code Snippet]]

Implementation Tips

Namespace Considerations: Ensure the network policies apply to the correct namespaces. Policies may differ based on whether services are inside or outside certain namespaces.

Order Matters: The order in which these policies are applied is crucial. A lower number in the order indicates a higher precedence.

Testing and Validation: Always test your configuration after applying the policies to ensure that the desired behavior is achieved. You may use tools like kubectl to verify if your ingress settings are functioning as intended.

Conclusion

By implementing a combination of a deny all policy followed by specific allow rules using Calico’s GlobalNetworkPolicy, you can effectively control traffic to your AKS external load balancer. This approach secures your applications while providing access to authorized IP ranges, aligning with best security practices.

If you have any questions or need further clarification on any of the steps, feel free to reach out!