Messages in this thread |  | | Date | Thu, 7 Sep 2000 11:00:38 -0700 (PDT) | From | <> | Subject | Re: linux kernel TCP, network connections and iptables |
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On Thu, 7 Sep 2000 kuznet@ms2.inr.ac.ru wrote: > Hello! > > - Could there be some kind of handling for such packets (meaning TCP packets > > reaching at an unused port with ACK bit set - with no previous SYN etc packet) > > to avoid such DoS attacks? Is the same happening to newer kernels? If yes, > > should we just eat it and shut up (because that's the way TCP works and it > > will not change)? > > TCP MUST do this and this cannot be changed. > > > - To do something about the above DoS,... > > By any _formal_ criteria there is no DoS here. You reply with one packet > to each incoming packet and do not hold any state. Where is DoS?
I believe that the DoS is that the path through the kernel turns out to be long and that a lot of these packets will bring a machine to its knees.
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