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What is Cloudflare?

Basics, practical use and limitations

What does Cloudflare provide?

Cloudflare offers services including authoritative DNS, a reverse proxy with CDN features and security services. Availability depends on plan and configuration. Network size, pricing and product scope change; consult current provider documentation.

DNS-only or proxied?

A DNS-only record returns the configured destination address. With proxying enabled, supported traffic passes through Cloudflare and DNS typically returns Cloudflare addresses. The origin still needs secure configuration. Hiding an address alone does not prevent direct access or information leaks.

TLS and visitor addresses

Visitor-to-Cloudflare and Cloudflare-to-origin connections are separate. Configure an encrypted, correctly validated origin connection. Visitor IPs must be obtained from trusted proxy information. Arbitrary clients must not be able to supply trusted forwarding headers themselves. This also applies to a CloudPanel website.

The 1.1.1.1 resolver

The public 1.1.1.1 resolver is separate from authoritative DNS for your domain. Cloudflare publishes its own privacy and logging rules for it; saying there are no logs at all is too broad. Check DNS records, certificates and HTTP responses when testing. A CF-Ray header can indicate processing through Cloudflare, but does not prove a complete protection setup.

Sources and further reading

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