Messages in this thread | | | Subject | Re: SYN trouble, hardware or software? | From | SL Baur <> | Date | 22 Jul 1998 11:26:55 -0700 |
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Andi Kleen <ak@muc.de> writes in linux-kernel@vger.rutgers.edu:
> Geert Uytterhoeven <Geert.Uytterhoeven@cs.kuleuven.ac.be> writes: >> On Wed, 22 Jul 1998, Chris Black wrote: >> > Jul 21 20:47:58 isrec-insect kernel: Warning: possible SYN flood from >> > 192.168.1.12 on 192.168.1.1:20817. Sending cookies. ... > The warning simply means that connection requests are comming in faster > than the server can process them.
I got the following on 2.0.34 while debugging some network software I was writing. At no time did I have more than one client at a time trying to connect to the server. The listen queue is short, but that shouldn't matter if only one client at a time is trying to connect, or should it?
Is SYN flooding a threat over the loopback device?
Jul 19 23:19:12 altair kernel: Warning: possible SYN flood from 127.0.0.1 on 127.0.0.1:23000. Sending cookies. Jul 19 23:29:22 altair kernel: Warning: possible SYN flood from 127.0.0.1 on 127.0.0.1:23000. Sending cookies.
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