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Copy file name to clipboardExpand all lines: src/content/docs/dns/internal-dns/get-started.mdx
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### (Optional) Reference a zone from another zone
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1. Use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint to add a reference from an internal zone to another internal zone. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`. For details, refer to [reference zones](/dns/internal-dns/internal-zones/#reference-zones).
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1. Use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint to add a reference from an internal zone to another internal zone. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`. For details, refer to [reference zones](/dns/internal-dns/internal-zones/reference-zones/).
Copy file name to clipboardExpand all lines: src/content/docs/dns/internal-dns/index.mdx
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end
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```
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Internal DNS zones contain the <GlossaryTooltipterm="DNS record"link="/dns/internal-dns/internal-zones/#internal-dns-records">DNS records</ GlossaryTooltip> that should be used to resolve an internal DNS query. Also, if no internal record is found within a matching internal zone, Cloudflare will check if the matching internal zone is [referencing another internal zone](/dns/internal-dns/internal-zones/#reference-zones).
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Internal DNS zones contain the <GlossaryTooltipterm="DNS record"link="/dns/internal-dns/internal-zones/internal-dns-records/">DNS records</ GlossaryTooltip> that should be used to resolve an internal DNS query. Also, if no internal record is found within a matching internal zone, Cloudflare will check if the matching internal zone is [referencing another internal zone](/dns/internal-dns/internal-zones/reference-zones/).
Copy file name to clipboardExpand all lines: src/content/docs/dns/internal-dns/internal-zones/index.mdx
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label: Internal zones
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---
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import { Example, Render } from"~/components";
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import { Example, Render, DirectoryListing } from"~/components";
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Internal DNS zones are groupings of internal DNS records. While [public DNS records](/dns/manage-dns-records/) contain information about resources that you want to make available to the public Internet, [internal DNS records](#internal-dns-records) allow you to manage resources that should only be available within your private network.
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Internal DNS zones are groupings of internal DNS records. While [public DNS records](/dns/manage-dns-records/) contain information about resources that you want to make available to the public Internet, [internal DNS records](/dns/internal-dns/internal-zones/internal-dns-records/) allow you to manage resources that should only be available within your private network.
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Refer to [Manage internal zones](/dns/internal-dns/internal-zones/setup/) for a full list of configuration conditions and step-by-step instructions.
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Internal DNS zones do not get assigned Cloudflare nameservers and can only be queried via [Cloudflare Gateway](/cloudflare-one/policies/gateway/resolver-policies/) when linked to a [DNS view](/dns/internal-dns/dns-views/). The Gateway configuration must exist within the same Cloudflare account where the internal zone exists.
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## Reference zones
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## Resources
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<Renderfile="reference-zone-intro" />
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Refer to [Set up reference zones](/dns/internal-dns/internal-zones/reference-zones/) for step-by-step instructions.
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## Internal DNS records
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Internal zones can contain the same [DNS record types](/dns/manage-dns-records/reference/dns-record-types/) that Cloudflare supports for public zones.
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You can manage internal DNS records in the same way as you would manage public DNS records, with the difference that [proxy status](/dns/proxy-status/) does not apply to internal DNS records.
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Refer to [Manage DNS records](/dns/manage-dns-records/how-to/create-dns-records/) or to the [API documentation](/api/resources/dns/subresources/records/) for further guidance.
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### CNAME flattening
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With CNAME flattening, Cloudflare finds the IP address that a CNAME points to and then returns the final IP address instead of a CNAME record. With Internal DNS, this behavior is applied by default and cannot be turned off.
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Cloudflare will try to flatten the CNAME record within the same [DNS view](/dns/internal-dns/dns-views/). If that is not possible, the following will happen:
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1. The CNAME record is returned to Gateway resolver as-is.
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2. Gateway resolver will process the returned record, depending on the **Fallback through public DNS** configuration:
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- On: Gateway will try to resolve the query by sending it to Cloudflare's public DNS resolver ([1.1.1.1](/1.1.1.1/)).
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- Off: Gateway will return the response as-is to the client.
Internal zones can contain the same [DNS record types](/dns/manage-dns-records/reference/dns-record-types/) that Cloudflare supports for public zones.
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You can manage internal DNS records in the same way as you would manage public DNS records, with the difference that [proxy status](/dns/proxy-status/) does not apply to internal DNS records.
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Refer to [Manage DNS records](/dns/manage-dns-records/how-to/create-dns-records/) or to the [API documentation](/api/resources/dns/subresources/records/) for further guidance.
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### CNAME flattening
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With CNAME flattening, Cloudflare finds the IP address that a CNAME points to and then returns the final IP address instead of a CNAME record. With Internal DNS, this behavior is applied by default and cannot be turned off.
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Cloudflare will try to flatten the CNAME record within the same [DNS view](/dns/internal-dns/dns-views/). If that is not possible, the following will happen:
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1. The CNAME record is returned to Gateway resolver as-is.
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2. Gateway resolver will process the returned record, depending on the **Fallback through public DNS** configuration:
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- On: Gateway will try to resolve the query by sending it to Cloudflare's public DNS resolver ([1.1.1.1](/1.1.1.1/)).
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- Off: Gateway will return the response as-is to the client.
Copy file name to clipboardExpand all lines: src/content/docs/dns/internal-dns/internal-zones/reference-zones.mdx
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pcx_content_type: how-to
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title: Set up reference zones
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title: Reference zones
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sidebar:
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<Renderfile="reference-zone-intro" />
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## Steps
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## Set up
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To set up a reference zone, use the [Update DNS settings](/api/resources/dns/subresources/settings/methods/edit/) endpoint. In `--data`, specify the `internal_dns` object with the parameter `reference_zone_id`.
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