fail2ban missing whois program
missing whois program in fail2ban email alerts . you are not able to receive IP information .
#yum search whois
gnome-nettool.x86_64 : A GNOME interface for various networking tools
jwhois.x86_64 : Internet whois/nicname client.
perl-Net-Whois.noarch : Get and parse “whois” domain data from InterNIC
perl-Net-Whois-IP.noarch : Perl extension for looking up the whois information
: for ip addresses
# yum install jwhois.x86_64
now test whois command