Portscan Protection

Shell script that automatically blocks IPs port-scanning a Linux server.

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Portscan Protection is a shell script that automatically blocks IPs port-scanning a Linux server, using either iptables or nftables with whitelist/blacklist support scaling to tens of thousands of entries, systemd/cron scheduling, and self-updating. It's for Linux sysadmins who want automatic defense against the scan-then-crack pattern attackers use against SSH and other open ports.

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Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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