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[DNS] Document orange-to-orange partial zones behavior #25756

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Oct 21, 2025
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[DNS] Document orange-to-orange partial zones behavior #25756

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Add note about orange-to-orange partial zones
RebeccaTamachiro Oct 10, 2025
621dfa9
Fall back to adding gaph instead of only note
RebeccaTamachiro Oct 16, 2025
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28 changes: 28 additions & 0 deletions src/content/docs/dns/zone-setups/partial-setup/dns-resolution.mdx
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Expand Up @@ -85,3 +85,31 @@ In this case, Cloudflare will always resolve the CNAME target based on the value
C
end
```

### Auth DNS points to `cdn.cloudflare.net`

Considering the following scenario:

- The target zone (Cloudflare zone 2 in this example) is a partial zone and the DNS record on the partial is proxied.
- The DNS record on the authoritative DNS server points to `cdn.cloudflare.net`

If such setup is in place, the subdomain (`www.partialzone.com` in this example) will resolve to a Cloudflare proxy IP, which will ultimately result in an error. Consider using [custom hostnames](/cloudflare-for-platforms/cloudflare-for-saas/domain-support/) and [Orange-to-Orange](/cloudflare-for-platforms/cloudflare-for-saas/saas-customers/how-it-works/) setup instead.

```mermaid
flowchart TD
accTitle: DNS resolution flow with CNAME target in a zone within the same account and auth DNS pointing to cdn.cloudflare.net
A[Request to <code>www\.alice.com</code>] --> B[<code>CNAME</code> record for <code>www\.alice.com</code> to <code>www\.partialzone.com</code>]
B --> C[<code>CNAME</code> record for <code>www\.partialzone.com</code> to <code>www\.partialzone.com.cdn.cloudflare.net</code>]
C --> D[<code>Cloudflare proxy IP</code>]
subgraph Cloudflare account
subgraph Cloudflare zone 1
B
end
subgraph Cloudflare zone 2
E[Proxied <code>A</code> record for <code>www\.partialzone.com</code> to <code>203.0.113.1</code>]
end
end
subgraph Authoritative DNS
C
end
```