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modules/ossm-migrating-read-me-dns-capture-configuration.adoc

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If your workloads use `ServiceEntry` resources to access external services through DNS names, you must explicitly configure DNS capture in the proxy metadata settings when migrating to {SMProductName} 3.0. Without DNS capture enabled, applications encounter DNS resolution failures with errors such as `Name or service not known`.
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To maintain access to external services when migrating to {SMProductName} 3.0, you must explicitly enable DNS capture in the proxy metadata settings.
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This is required for any `ServiceEntry` resources that rely on DNS resolution. Failure to enable this feature results in application errors such as `Name or service not known`.
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{SMProduct} 2.6 enabled DNS capture by default to support federation, which did not align with the upstream {istio} project. {SMProduct} 3.0 removes this default configuration and aligns with the upstream project's multicluster topologies.
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