istio.io/content/en/docs/reference/glossary/hbone.md

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---
title: HBONE
test: n/a
---
HBONE (or HTTP-Based Overlay Network Environment) is a secure tunneling protocol used between Istio components.
In HBONE, users traffic is securely tunneled over HTTP `CONNECT` tunnels encrypted with [Mutual TLS Authentication](/docs/reference/glossary/#mutual-tls-authentication).