this post was submitted on 22 Jul 2023
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If your origin servers IP is never revealed then all traffic goes through cloudflare regardless. Firewall restricting the IPs is just good practice since cloudflare is the only IP that is supposed to talk to that server anyway, but it's not a requirement.
I can see some overhead if you're maintaining a large blacklist, but I don't see it happening with a small whitelist and default inbound DROP
Oh absolutely, I agree with the best practice! I just didn't know the real world efficacy of dropping packets near the NIC to mitigate DDOS load. There is certainly a performance limit but where that limit exists has been nebulous for me.