One to two lines of iptables limits connection attempts, making a brute force attack take thousands of years. No logging, no monitoring, no extra software. If

One to two lines of iptables limits connection attempts, making a brute force attack take thousands of years. No logging, no monitoring, no extra software. If you only use SSH keys, no brute force attack will work anyway. https://www.systutorials.com/how-to-use-iptables-to-limit-rates-new-ssh-incoming-connections-from-each-ip-on-linux/ https://www.systutorials.com/how-to-use-iptables-to-limit-ra... https://making.pusher.com/per-ip-rate-limiting-with-iptables/ https://making.pusher.com/per-ip-rate-limiting-with-iptables... https://stackoverflow.com/questions/18616246/iptables-limit-number-of-new-ssh-connections-per-minute https://stackoverflow.com/questions/18616246/iptables-limit-... https://blog.oshim.net/2009/06/iptables-to-rate-limit-incoming/ https://blog.oshim.net/2009/06/iptables-to-rate-limit-incomi... https://stackoverflow.com/questions/47775809/iptables-rate-limiting-connection-request#48194151 https://stackoverflow.com/questions/47775809/iptables-rate-l... http://blog.serverbuddies.com/using-iptables-to-rate-limit-incoming-connections/ http://blog.serverbuddies.com/using-iptables-to-rate-limit-i...