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2013 Mar 06
3
CentOS 5 sshd does not log IP address of reverse mapping failure
I'm running a mix of CentOS 5 and 6 servers reachable by ssh from the Internet. Of course I allow only public key authentication and no root login. In addition I'm running fail2ban to block obnoxious brute force attack sources. On CentOS 6 this is working pretty well, but on CentOS 5 there's one class of attacks fail2ban fails to ban. (No pun intended.) This isn't fail2ban's