Mailinglist Archive: opensuse-security (232 mails)

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Re: [suse-security] Under DDoS Attack...
  • From: suse@xxxxxxxxxxxx
  • Date: Thu, 27 Oct 2005 16:41:53 +0100 (BST)
  • Message-id: <Pine.LNX.4.61.0510271638160.32460@xxxxxxxxxxxx>

Check this link out.

If you can identify the IP addresses where the bad packets
are coming from, you may be able to contact your ISP, tell
them what is happening, and ask them to program their
routers to stop the bad packets getting to your part of the

HTH - Keith Roberts

On Thu, 27 Oct 2005, media Formel4 wrote:

> To: suse-security@xxxxxxxx
> From: media Formel4 <info@xxxxxxxxxx>
> Subject: [suse-security] Under DDoS Attack...
> Hi list,
> right now we're experiencing a (for me) very uncommon DDoS attack against
> one of our webservers. Looking with netstat we find hundreds of
> established connections to our Apache webserver, but nothing in the logs -
> which means the attacker opens up a connection (not only a SYN request as
> in SYN flood attacks) and then blocks the Apache child until it hits
> timeout. This attack comes from thousands of IP numbers (bots?) all over
> the world.
> Question is:
> - Is it possible with spoofed IP numbers to establish connections to port
> 80? As far as I know you should get stuck after "SYN".
> - How can I secure this server and/or stop this attack?
> Thanks,
> Ralf Koch
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