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bouncers are standalone software pieces in charge of acting upon blocked IPs.

They can either within the applicative stack, or work out of band :

nginx blocker will check every unknown IP against the database before letting go through or serving a 403 to the user, while a netfilter blocker will simply "add" malevolent IPs to nftables/ipset set of blacklisted IPs.

You can explore available bouncers on the hub, and find below a few of the "main" bouncers :