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1. Use Fail2Ban to contact the IP provider's of bruteforce attacks source (Documentation/Mini Howto) ... $1: `whois $1` Lines containing IP: $1 in $3 `grep $1 $3` Regards, Fail2Ban"\|mail -s "[Fail2Ban] $2: banned $1" $i; done; Activate execution right: # chmod 750 mail-whois.sh Now you have ... 2. Howto setup ssh keys on linux (Documentation/Mini Howto) ... ssh keys and authorized_keys file. ssh folder : chmod 700 .ssh id_rsa* and id_dsa* files : chmod 600 id_rsa id_dsa && chmod 640 id_*.pub authorized_keys : chmod 600 authorized_keys ... 3. Linux command Line (Documentation/System Documentation) ... gunzip tar zip Right and permission administration useradd usermod userdel groupadd groupmod groupdel chmod chown who Linux File System and analyze ... 4. Howto install pure-ftpd with a database mysql or postgresql (Documentation/Howto) ... 21809338 # This log file can then be processed by www traffic analyzers. AltLog clf:/var/log/pureftpd.log # Be 'customer proof' : workaround against common customer mistakes like # 'chmod 0 public_html', ... 5. IPV6 (Documentation/Network Documentation) ... is generally stored in /usr/sbin -> add path (not really recommended) ping6 doesn't execute properly, generally because of missing root permissions -> chmod u+s /usr/sbin/ping6 4.3.1.1. Specifying ...