Check this link out. http://www.grc.com/dos/drdos.htm 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 network. HTH - Keith Roberts On Thu, 27 Oct 2005, media Formel4 wrote:
To: suse-security@suse.com From: media Formel4 <info@formel4.de> 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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