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Clarify IPv6-only docs interface binding #972

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Jan 16, 2025
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Clarify IPv6-only docs interface binding #972

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11 changes: 9 additions & 2 deletions docs/src/snap/howto/networking/ipv6.md
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Expand Up @@ -28,15 +28,22 @@ only IPv6 CIDRs are used.
Start by bootstrapping the Kubernetes cluster and providing only IPv6
CIDRs for pods and services:

```{important}
To run an IPv6-only cluster on a host with both IPv4 and IPv6 interfaces,
you must include `--address ::/0` in the bootstrap and join commands.
Without this option, the snap will attempt to bind to the IPv4 interface,
which will fail if only IPv6 CIDRs are configured.
```

```bash
sudo k8s bootstrap --timeout 10m --interactive
```

When prompted, set the pod and service CIDRs to IPv6 ranges. For example:

```
Please set the Pod CIDR: [fd01::/108]
Please set the Service CIDR: [fd98::/108]
Please set the Pod CIDR: fd01::/108
Please set the Service CIDR: fd98::/108
```

Alternatively, these values can be configured in a bootstrap configuration file
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