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Document Gateway's blocking behaviour for DNS queries other than A/AAAA #22789

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Merged
merged 3 commits into from
Jun 2, 2025
Merged

Document Gateway's blocking behaviour for DNS queries other than A/AAAA #22789

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Document Gateway's blocking behaviour for DNS queries other than A/AAAA
lfcassidy May 30, 2025
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maxvp Jun 2, 2025
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maxvp Jun 2, 2025
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4 changes: 4 additions & 0 deletions src/content/docs/cloudflare-one/policies/gateway/block-page.mdx
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Expand Up @@ -123,6 +123,10 @@ If your users receive a security risk warning in their browser when visiting a b

For more information on fixing certificate issues, refer to [Troubleshooting](/cloudflare-one/faq/troubleshooting/#as-of-february-2-2025-my-end-user-devices-browser-is-returning-a-your-connection-is-not-private-warning).

### Incompatible DNS record types

<Render file="gateway/block-page-dns-records" product="cloudflare-one" />

### Third-party filtering conflict

<Render file="gateway/third-party-warning" />
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2 changes: 2 additions & 0 deletions src/content/docs/cloudflare-one/policies/gateway/dns-policies/index.mdx
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Expand Up @@ -144,6 +144,8 @@ When choosing the Block action, turn on **Modify Gateway block behavior** to res

If the block page is turned off for a policy, Gateway will respond to queries blocked at the DNS level with an `A` record of `0.0.0.0` for IPv4 destinations, or with an `AAAA` record of `::` for IPv6 destinations. The browser will display its default connection error page.

<Render file="gateway/block-page-dns-records" product="cloudflare-one" />

#### WARP client block notifications

<Render
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5 changes: 5 additions & 0 deletions src/content/partials/cloudflare-one/gateway/block-page-dns-records.mdx
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@@ -0,0 +1,5 @@
---
{}
---

To block the resolution of queries for DNS records with types other than `A` or `AAAA`, Gateway will respond with the `REFUSED (RCODE:5)` DNS return code. Gateway will block the request but will not display a block page.
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