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Definitely use fail2ban as Simon's answer recommends, because it protects against other issues in its default configuration. You mention the machine is running out of memory though, and fail2ban needs to monitor your logs and react to these bots, which uses memory. You may still run out of resources and if that happens you need something more efficient. I ...


BOTS, CRAWLERS and SCRAPERS use IP addresses in blocks, its rare to see one that will use the same IP address over and over. IP blocks are often sold, brought and then sold again! some of these blocks will resolve, some will not depending on the setup they use, because of this banning IP from a resolve is useless, because you risk banning real users, using ...

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