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support/azure/azure-kubernetes/extensions/istio-add-on-ingress-gateway.md

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title: Istio service mesh add-on ingress gateway troubleshooting
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description: Learn how to do ingress gateway troubleshooting on the Istio service mesh add-on for Azure Kubernetes Service (AKS).
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ms.date: 07/03/2024
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ms.date: 03/17/2025
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author: nshankar13
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ms.author: nshankar
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editor: v-jsitser
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### Step 6: Customize ingress gateway service settings
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The add-on also supports [customizing the Kubernetes service for the Istio ingress gateway](/azure/aks/istio-deploy-ingress#ingress-gateway-service-customizations) for certain annotations as well as the `spec.externalTrafficPolicy` setting. In certain cases, modifying the `spec.externalTrafficPolicy` to `Local` can assist with troubleshooting connectivity and networking issues, as it preserves the client source IP for the incoming request at the ingress gateway.
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The add-on also supports [customizing the Kubernetes service for the Istio ingress gateway](/azure/aks/istio-deploy-ingress#ingress-gateway-service-customizations) for certain annotations and the `.spec.externalTrafficPolicy` setting. In certain cases, changing the `.spec.externalTrafficPolicy` to `Local` can assist with troubleshooting connectivity and networking issues, as it preserves the client source IP for the incoming request at the ingress gateway.
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> [!NOTE]
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> Modifying the `spec.externalTrafficPolicy` to `Local` risks potentially imbalanced traffic spreading. Before applying this change, it is recommended to read the [Kubernetes docs](https://kubernetes.io/docs/tasks/access-application-cluster/create-external-load-balancer/#preserving-the-client-source-ip) to understand the tradeoffs between the different `externalTrafficPolicy` settings.
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> Changing the `.spec.externalTrafficPolicy` to `Local` might cause imbalanced traffic spreading. Before applying this change, we recommend reading the Kubernetes document about [Preserving the client source IP](https://kubernetes.io/docs/tasks/access-application-cluster/create-external-load-balancer/#preserving-the-client-source-ip) to understand the tradeoffs between the different `externalTrafficPolicy` settings.
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## References
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