fail2ban is good for preventing spam and DDOS on authenticated endpoints, but it’s harder to prevent attacks on public endpoints against a botnet or even a lazy proxy chain spam, which is why cloudflare adds some cookies and a buffer to handle a wave of new connections and maintain an address rank to drop any bad clients.
Although that being said, cloudflare can be bypassed via other timing tricks and even just using a specific request chain to get fresh cf cookies to avoid getting blocked.
fail2ban is good for preventing spam and DDOS on authenticated endpoints, but it’s harder to prevent attacks on public endpoints against a botnet or even a lazy proxy chain spam, which is why cloudflare adds some cookies and a buffer to handle a wave of new connections and maintain an address rank to drop any bad clients.
Although that being said, cloudflare can be bypassed via other timing tricks and even just using a specific request chain to get fresh cf cookies to avoid getting blocked.