-----Original Message----- From: rob.vercoute...@kpn.com [mailto:rob.vercoute...@kpn.com] Sent: Wednesday, November 30, 2011 3:05 PM To: matlo...@exempla.org; richard.bar...@gmail.com; andrew.wall...@rocketmail.com Cc: nanog@nanog.org; lel...@taranta.discpro.org Subject: RE: Recent DNS attacks from China?
Yes it is, but the problem is that our servers are "attacking" the so called source address. All the answers are going back to the "source". It is huge amplification attacks. (some sort of smurf if you want) The ip addresses are spoofed (We did a capture and saw all different ttl's so coming from behind different hops) And yes we saw the ANY queries for all the domains. I still wonder how it is still possible that ip addresses can be spoofed nowadays ================= Rob, Transit providers can bill for the denial of service traffic and they claim it's too expensive to run URPF because of the extra lookup. -Drew
