How do I protect my CentOS server from a DDOS and Shell attacks :L
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you should look into a solution from Solarflare Communications. They have developed solution to protect Linux kernel from DDOS attacks.
You can’t. The best you can do is hope to mitigate the disruption. Start w/a firewall; a non-standard port for SSH; fail2ban; SSH-key (i.e. passwordless) logins; and a monitoring tool. <br> <br>For websites, <a href=“https://www.cloudflare.com/”>CloudFlare</a>, provides a good service (and they even have a free plan).