Google Groups is meant for general product discussions and not for technical support. If you require technical support for accessing the internal IP of your GKE cluster from App Engine Flexible, the correct place is your post <https://stackoverflow.com/questions/45912802/how-do-i-make-app-engine-flexible-to-connect-to-container-engine-via-internal-ip> on Stack Overflow <https://cloud.google.com/support/docs/stackexchange>. If you are instead requesting for this feature, it is recommended to file a feature request <https://cloud.google.com/support/docs/issue-trackers>.
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