# IPv6 Support

{% hint style="info" %}
Remarkably, this setup allows hosting Bitcart in IPv6-only environment! You can [proxy Bitcart using Cloudflare](/proxying-bitcart/cloudflare.md), just add DNS AAAA record and enable proxy ("orange cloud"). This being will enable serving IPv4-only customers even without having dedicated IPv4 address.
{% endhint %}

To enable IPv6 support in Bitcart for Docker deployment, changes to Docker daemon must be applied. In the file `/etc/docker/daemon.json`, the following parameters must be added:

* `"ipv6": true`
* `"fixed-cidr-v6": "2001:db8:1::/64"`
* `"default-address-pools"`:

```json
"default-address-pools": [
  {"base":"172.17.0.0/16","size":16},
  {"base":"172.18.0.0/16","size":16},
  {"base":"172.19.0.0/16","size":16},
  {"base":"172.20.0.0/14","size":16},
  {"base":"172.24.0.0/14","size":16},
  {"base":"172.28.0.0/14","size":16},
  {"base":"192.168.0.0/16","size":20},
  {"base":"2001:db8::/56","size":64}
]
```

Please note that `2001:db8:1::/64` and `2001:db8::/56` must be changed to the IPv6 prefix provisioned by your hosting provider. Final file should look a similar way:

```json
{
  "ipv6": true,
  "fixed-cidr-v6": "2001:db8:1::/64",
  "default-address-pools": [
    {"base":"172.17.0.0/16","size":16},
    {"base":"172.18.0.0/16","size":16},
    {"base":"172.19.0.0/16","size":16},
    {"base":"172.20.0.0/14","size":16},
    {"base":"172.24.0.0/14","size":16},
    {"base":"172.28.0.0/14","size":16},
    {"base":"192.168.0.0/16","size":20},
    {"base":"2001:db8::/56","size":64}
  ],
  "log-driver": "json-file",
  "log-opts": {"max-size": "5m", "max-file": "3"}
}
```

After saving `/etc/docker/daemon.json` configuration file, ensure to apply the new settings:

```bash
sudo systemctl restart docker
```

{% hint style="warning" %}
If you are running Bitcart behind another reverse proxy (e.g. Caddy, Nginx), ensure to refer to the [custom reverse proxy guide](/proxying-bitcart/custom-reverse-proxy.md) as well. In that case, it is better to enable IPv6 only on the reverse proxy itself, rather than in Bitcart. To do so, add the following to your Docker Compose file for the reverse proxy's network:

```yaml
networks:
  default:
    enable_ipv6: true
```

This way, Bitcart does not need the `opt-add-ipv6` component at all.
{% endhint %}

The last step is to enable IPv6 support in Bitcart:

```bash
cd
cd bitcart-docker
export BITCART_ADDITIONAL_COMPONENTS=opt-add-ipv6
./setup.sh
```

{% hint style="warning" %}
If you have some other additional components enabled, ensure to list all of them using comma, for example this will enable both tor and IPv6:

```bash
export BITCART_ADDITIONAL_COMPONENTS=tor,opt-add-ipv6
```

To see if you have any additional components enabled:

```bash
echo ${BITCART_ADDITIONAL_COMPONENTS}
```

{% endhint %}

Now, you are ready to add DNS AAAA record to your domain registrar or at Cloudflare dashboard.


---

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