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update how to persist enabling ipv6 forwarding across reboot #48572

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update how to persist enabling ipv6 forwarding across reboot #48572

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26 changes: 24 additions & 2 deletions content/en/docs/setup/production-environment/tools/kubeadm/dual-stack-support.md
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Expand Up @@ -22,8 +22,30 @@ You need to have installed the {{< glossary_tooltip text="kubeadm" term_id="kube
following the steps from [Installing kubeadm](/docs/setup/production-environment/tools/kubeadm/install-kubeadm/).

For each server that you want to use as a {{< glossary_tooltip text="node" term_id="node" >}},
make sure it allows IPv6 forwarding. On Linux, you can set this by running run
`sysctl -w net.ipv6.conf.all.forwarding=1` as the root user on each server.
make sure it allows IPv6 forwarding.

### Enable IPv6 packet forwarding {#prerequisite-ipv6-forwarding}

To check if IPv6 packet forwarding is enabled:

```bash
sysctl net.ipv6.conf.all.forwarding
```
If the output is `net.ipv6.conf.all.forwarding = 1` it is already enabled.
Otherwise it is not enabled yet.

To manually enable IPv6 packet forwarding:

```bash
# sysctl params required by setup, params persist across reboots
cat <<EOF | sudo tee -a /etc/sysctl.d/k8s.conf
net.ipv6.conf.all.forwarding = 1
EOF

# Apply sysctl params without reboot
sudo sysctl --system
```


You need to have an IPv4 and and IPv6 address range to use. Cluster operators typically
use private address ranges for IPv4. For IPv6, a cluster operator typically chooses a global
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