The further question that comes to my mind is who would enforce blocking
based on this list? It seems to me that if the subscribers to the list were
anything other than ISPs, there would be little point to it. By the time
you're blocking at your firewall, the DDoS traffic has already consumed what
bandwidth it was meant to consume. And this is, of course, in addition to
your concerns about DHCP addressing and spoofed source addresses.
-----Original Message-----
From: Andy Cuff [mailto:lists@securitywizardry.com]
Sent: Sunday, November 14, 2004 5:27 PM
To: focus-ids@securityfocus.com
Subject: DDOS Bot Blacklist
Hi,
I was wondering if anyone had looked into the creation of a
blacklist for DDOS bots?
There are obvious concerns; firstly, where the source may be
spoofed, though most of the Attack Mitigation Systems should
deal with stateless attacks and secondly, with so many of the
bots originating from DHCP scopes, many bots this could be
overcome by rapid aging of the addresses or only including
addresses used more than once indicating a long term address
lease in the scope.
Regards
-andy cuff
The Talisker Network Security Portal http://securitywizardry.com
Computer Network Defence Ltd
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