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

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---
title: ztunnel
test: n/a
---
Ztunnel refers to the node proxy component of [ambient](/docs/reference/glossary/#ambient) data plane mode.
Ztunnel runs on each node and securely transmits traffic using the [HBONE](/docs/reference/glossary/#hbone) protocol.
For more details, see [ambient data plane documentation](/docs/ambient/architecture/data-plane/)