[lkml]   [2000]   [Sep]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: linux kernel TCP, network connections and iptables
On Thu, 7 Sep 2000 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.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:38    [W:0.062 / U:1.780 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site