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DDOS attack please help!

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Homework and Emergencies Emergency UNIX and Linux Support DDOS attack please help!
# 8  
Is it a SYN flood attatack?

I found net.ipv4.tcp_syncookies helped for my servers, and I would use
ip route add blackhole x.x.x.x

and in our case the attacker would get bored.

Not too clever but OK as a quick emergency fix.

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A2ENSITE(8)						      System Manager's Manual						       A2ENSITE(8)

a2ensite, a2dissite - enable or disable an apache2 site / virtual host SYNOPSIS
a2ensite [site] a2dissite [site] DESCRIPTION
This manual page documents briefly the a2ensite and a2dissite commands. a2ensite is a script that enables the specified site (which contains a <VirtualHost> block) within the apache2 configuration. It does this by creating symlinks within /etc/apache2/sites-enabled. Likewise, a2dissite disables a site by removing those symlinks. It is not an error to enable a site which is already enabled, or to disable one which is already disabled. The default site is handled specially: The resulting symlink will be called 000-default in order to be loaded first. EXAMPLES
a2dissite default Disables the default site. FILES
/etc/apache2/sites-available Directory with files giving information on available sites. /etc/apache2/sites-enabled Directory with links to the files in sites-available for enabled sites. SEE ALSO
apache2ctl(8). AUTHOR
This manual page was written by Stefan Fritsch <> (based on the a2enmod manual page by Daniel Stone <>) for the Debian GNU/Linux distribution. 8 June 2007 A2ENSITE(8)

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