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Full Discussion: DDOS attack please help!
Homework and Emergencies Emergency UNIX and Linux Support DDOS attack please help! Post 302907858 by Neo on Wednesday 2nd of July 2014 06:05:43 AM
Old 07-02-2014
It's hard to use iptables effectively to mitigate an DDOS attack with changing IP addresses.

Most attackers easily change IP addresses; but they forget to change the User Agent string, so it's often easier to block the hackers User Agent string. Did you do any analysis on the UA strings?

Also, if you are using Apache2, there may be an anti-DDOS module, as I recall.
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Agent::Driver::Syslog(3pm)				User Contributed Perl Documentation				Agent::Driver::Syslog(3pm)

NAME
Log::Agent::Driver::Syslog - syslog logging driver for Log::Agent SYNOPSIS
use Log::Agent; require Log::Agent::Driver::Syslog; my $driver = Log::Agent::Driver::Syslog->make( -prefix => prefix, -facility => "user", -showpid => 1, -socktype => "unix", -logopt => "ndelay", ); logconfig(-driver => $driver); DESCRIPTION
The syslog logging driver delegates logxxx() operations to syslog() via the Sys::Syslog(3) interface. The creation routine make() takes the following switches: "-facility" => facility Tell syslog() which facility to use (e.g. "user", "auth", "daemon"). Unlike the Sys::Syslog(3) interface, the facility is set once and for all: every logging message will use the same facility. If you wish to log something to "auth" for instance, then do so via Sys::Syslog directly: there is no guarantee that the application will configure its Log::Agent to use syslog anyway! "-logopt" => syslog options Specifies logging options, under the form of a string containing zero or more of the words ndelay, cons or nowait. "-prefix" => prefix The prefix here is syslog's identification string. "-showpid" => flag Set to true to have the PID of the process logged. It is false by default. "-socktype" => (unix | inet) Specifies the logging socket type to use. The default behaviour is to use Sys:Syslog's default. CHANNELS
All the channels go to syslog(), of course. AUTHOR
Raphael Manfredi <Raphael_Manfredi@pobox.com> SEE ALSO
Log::Agent::Driver(3), Log::Agent::Channel::Syslog(3). perl v5.10.0 2002-03-09 Agent::Driver::Syslog(3pm)
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