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We have about 10 IP addresses trying to cause a DDOS attack on our organization. As soon as I block the addresses in the firewall another batch takes its place. This has been ongoing for about 10 hours. How can I stop this attack without changing my IP addresses?
Running Exchange 2005 is there a way to block specific IP ranges from our smtp server? Spammers keep trying to send spam and brute force passwords locking users out.
Does any one know about best practice to block attacker IP's? What commonly run's or install to block such activities in multinational companies regarding network security..... Please I need detail...