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a guest Jan 21st, 2015 202 Never
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  1. brute_force(){
  2.    echo -n "Preventing Brute Force Attacks..."
  3.  
  4.    ## Create New Chain
  5.    iptables -N BRUTE_FORCE
  6.  
  7.    ## FTP/Telnet/SSH
  8.    iptables -A INPUT -i $LAN_IF -p tcp -m conntrack --ctstate NEW -m multiport --dports 21,22,23 -j BRUTE_FORCE
  9.    iptables -A BRUTE_FORCE -m recent --hitcount 2 --rcheck --seconds 15 --name brute_force -m limit --limit 10/min -j ULOG --ulog-prefix "[BRUTE_FORCE DROP]: "
  10.    iptables -A BRUTE_FORCE -m recent --hitcount 2 --update --seconds 15 --name brute_force -j DROP
  11.    iptables -A BRUTE_FORCE -m recent --set --name brute_force -j RETURN
  12. }
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