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OSDOCS-161612:adds Layer2 EIP limitations for UDN #99162

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Sep 23, 2025
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OSDOCS-161612:adds Layer2 EIP limitations for UDN #99162

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10 changes: 9 additions & 1 deletion modules/nw-udn-limitations.adoc
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Expand Up @@ -28,4 +28,12 @@ While user-defined networks (UDN) offer highly customizable network configuratio

* *Connectivity limitation*: NodePort services on user-defined networks are not guaranteed isolation. For example, NodePort traffic from a pod to a service on the same node is not accessible, whereas traffic from a pod on a different node succeeds.

* *Unclear error message for IP address exhaustion*: When the subnet of a user-defined network runs out of available IP addresses, new pods fail to start. When this occurs, the following error is returned: `Warning: Failed to create pod sandbox`. This error message does not clearly specify that IP depletion is the cause. To confirm the issue, you can check the *Events* page in the pod's namespace on the {product-title} web console, where an explicit message about subnet exhaustion is reported.
* *Unclear error message for IP address exhaustion*: When the subnet of a user-defined network runs out of available IP addresses, new pods fail to start. When this occurs, the following error is returned: `Warning: Failed to create pod sandbox`. This error message does not clearly specify that IP depletion is the cause. To confirm the issue, you can check the *Events* page in the pod's namespace on the {product-title} web console, where an explicit message about subnet exhaustion is reported.

* *Layer2 egress IP limitations*:

** Egress IP does not work without a default gateway.

** Egress IP does not work on Google Cloud Platform (GCP).

** Egress IP does not work with multiple gateways and instead will forward all traffic to a single gateway.