Bloqueio DoS – recent + connlimit + limit

Bloqueia todas conexões de  IPs que estiverem na lista ips_bloqueados por 1 dia

iptables -A INPUT -m recent --rcheck --name ips_bloqueados --seconds 86400 -j DROP

Cadastra IPs que tentem abrir mais de 10 conexões na porta 80 em ate 60 segundos

iptables -A INPUT -p tcp --dport 80 -m connlimit --connlimit-above 10 -m limit --limit 60/sec -m recent --set --name ips_bloqueados --rsource -j LOG --log-prefix "ips_bloqueados: 10c_60s"
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