# istio_enable-auto-sni.yaml
apiVersion: release-notes/v2
kind: feature
area: security
releaseNotes:
- |
  **Updated** default value of the feature flag `ENABLE_AUTO_SNI` to true.
upgradeNotes:
- title: Default value of the feature flag `ENABLE_AUTO_SNI` to true
  content: |
    [auto_sni](https://www.envoyproxy.io/docs/envoy/latest/api-v3/config/core/v3/protocol.proto#envoy-v3-api-field-config-core-v3-upstreamhttpprotocoloptions-auto-sni)
    is enabled by default. This means SNI will be set automatically based on the downstream HTTP host/authority header if `DestinationRule` does not explicitly set the same.

    If this is not desired, use the new `compatibilityVersion` feature to fallback to old behavior.