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We have an old blog post detailing the ambient traffic redirection implementation (before inpod mode). We should add a warning telling users that we no longer configure host traffic.

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@Stevenjin8 Stevenjin8 requested a review from a team as a code owner December 2, 2025 15:59
@istio-testing istio-testing added the size/XS Denotes a PR that changes 0-9 lines, ignoring generated files. label Dec 2, 2025
@Stevenjin8 Stevenjin8 force-pushed the update/old-ambient-redirect-blog branch from 8a6a06c to 487e8a7 Compare December 2, 2025 16:02
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{{< warning >}}
Ambient redirection no longer configures the host network namespace as of Istio 1.21.
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Personally, I think we should add a note explaining that the approach in this blog post no longer applies to the current Istio release, since Ambient no longer uses GENEVE tunnels.

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... no longer configures the host network namespace as of Istio 1.21.

FWIW, in ambient mode, we do program some iptable/nftable rules on the host network namespace to support kubelet health-checks - https://github.com/istio/istio/tree/master/tools/istio-nftables/pkg#ambient-mode-specific-details

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I don't think we typically go and update old blogs, but will let TOC weigh-in here.

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Suggested change
See [ztunnel traffic redirection](/docs/ambient/architecture/traffic-redirection/) for details on the new approach.

ztunnel is lowercase.

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5 participants