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Unlike this ghetto Bash script, this program is written by actually-competent people (i.e. not me) in a reasonable language (Go).
A (or perhaps a few?) Bash scripts to update and block a known list of IPs that were abused.
A script that downloads a list of known abused IPs from a provider.
Currently uses AbuseIPDB as source.
A script that updates the system firewall to block incoming traffic from the list of IPs.
Currently uses iptables as firewall service.