[ic] DDoS (Distributed Denial of Service) attack causing interchange to fail

[davideth at whojamadoogle.com]

BTW, a firewall is useless against this type of DDoS because each IP 
address is only used once a day and since there are over 25000 IP 
addresses used in a day, the firewall would be overloaded trying to 
track them all. The only way to stop this is by using a human click 
response to a minimal page.