nanog mailing list archives

Re: BCP38 making it work, solving problems


From: "Stephen J. Wilcox" <steve () telecomplete co uk>
Date: Wed, 13 Oct 2004 17:59:18 +0100 (BST)


On 13 Oct 2004, Paul Vixie wrote:

How many people have seen "forged" spoofed IP addresses being used for DOS
attacks lately?

syn-flood protection, and random TCP ISS, are now common enough that
spoofed-source isn't effective for TCP flows.  if you want to bring down
somebody's web server then blackhats really do have to use real addresses.

of course the docs were written a couple years ago, and things have changed a
lot in that time. the proliference of and ease of establishing bot networks is
such that their controllers dont care if you track them and shut them down as 
they are easily replaced

Steve


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