Why couldn't I use the L4 protection?

As the title,why couldn’t I use the L4 protection

I believe Cloudflare Spectrum feature could help you to protect your origin IP.

Nevertheless, if you allowed only Cloudflare IPs and locked your ports at your origin + using Full (Strict) SSL and Authenticated Origin Pulls option, you are good to go.

Furthermore, you can do more with cloudflared tunnel (Argo), if interested.

I could be wrong due to the lack of experience with some Cloudflare features.

Kindly and patiently wait for another reply.

Because it’s enterprise only.

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but it says The ruleset is available for Cloudflare customers on all plans and is enabled by default. in https://support.cloudflare.com/hc/en-us/articles/200172676-Understanding-Cloudflare-DDoS-protection#network-ddos-managed-rules

Indeed though it seems to be Magic Transit or Spectrum Enterprise plan users and not specifically Enterprise https://developers.cloudflare.com/ddos-protection/managed-rulesets/network/

The Network-layer DDoS Attack Protection Managed Ruleset protects Cloudflare customers on all plans. However, only Magic Transit and Spectrum customers on an Enterprise plan can customize the Managed Ruleset.

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