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[DNS Firewall] Update recommended Max Cache TTL to 4 hours #19601

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Jan 31, 2025
Merged

[DNS Firewall] Update recommended Max Cache TTL to 4 hours #19601

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2 changes: 1 addition & 1 deletion src/content/docs/dns/dns-firewall/setup.mdx
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Expand Up @@ -32,7 +32,7 @@ Prior to setting up DNS Firewall, you need:
4. Fill out the required fields, including:
- **IP Addresses**: The upstream IPv4 and/or IPv6 addresses of your authoritative nameservers.
- **Minimum Cache TTL**: Recommended setting of **30 seconds**.
- **Maximum Cache TTL**: Recommended setting of **1 hour**. Larger values increase the cache hit ratio, but also increase the time required for DNS changes to propagate.
- **Maximum Cache TTL**: Recommended setting of **4 hours**. Larger values increase the cache hit ratio, but also increase the time required for DNS changes to propagate.
- **ANY queries**: Recommended setting is **Off** because these are often used as part of DDoS attacks. Also refer to this [blog post](https://blog.cloudflare.com/rfc8482-saying-goodbye-to-any/).
5. Click **Continue**.
6. On the following screen, save the values for **Your new DNS Firewall IP Addresses**.
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