Apache and 408s

Martijn van Oosterhout kleptog at svana.org
Mon Sep 17 17:37:48 EST 2001

On Mon, Sep 17, 2001 at 05:18:50PM +1000, Matthew Hawkins wrote:
> On Mon, 17 Sep 2001, Peter Barker wrote:
> > 	Anybody have any clues what it is? Seems rather odd for a
> > portscan, since they should probably disconnect after scanning the port,
> > and not time out.
> Not for a TCP SYN scan.  You send the SYN, and never ACK the reply.  The
> server sits there with an open socket till timeout.  This is why its
> important in server applications to include the concept of a timeout
> because you don't want to leave yourself wide open for a fd DoS attack.

Surely the application never gets notified unless the server receives the
ACK. So they would have to ACK the SYN-ACK and then go away, which seems
strange for a port scanner.

Martijn van Oosterhout <kleptog at svana.org>
> Magnetism, electricity and motion are like a three-for-two special offer:
> if you have two of them, the third one comes free.

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