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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::Mail(3pm)				User Contributed Perl Documentation				  Agent::Driver::Mail(3pm)

NAME
Log::Agent::Driver::Mail - email driver for Log::Agent SYNOPSIS
use Log::Agent; require Log::Agent::Driver::Mail; my $driver = Log::Agent::Driver::Mail->make( -to => 'oncall@example.org', -cc => [ qw( noc@example.org admin@example,net ) ], -subject => "ALERT! ALERT!", -mailer => [ 'smtp', Server => 'mail.example.net' ] ); logconfig(-driver => $driver); DESCRIPTION
This driver maps the logxxx() calls to email messages. Each call generates a separate email message. The Mail::Mailer module is required. CONSTRUCTOR
make OPTIONS The OPTIONS argument is a hash with the following keys: -prefix An optional prefix for the message body. -to The destination addresses, may be a scalar containing a valid email address or a reference to an array of addresses. -reply_to The reply-to addresses, may be a scalar containing a valid email address or a reference to an array of addresses. -from The source address, must be a scalar containing a valid email address. -subject The subject line of the email message. -cc The carbon copy addresses, may be a scalar containing a valid email address or a reference to an array of addresses. -bcc The blind carbon copy addresses, may be a scalar containing a valid email address or a reference to an array of addresses. -priority The priority level for the email message. This is NOT related to the logging priority. -mailer A reference to an array containing the optional arguments to Mail::Mailer->new(). Generally, this can be omitted. NOTES
Thanks to Shirley Wang for the idea for this module. AUTHOR
Mark Rogaski <mrogaski@pobox.com> LICENSE
Copyright (C) 2002 Mark Rogaski; all rights reserved. See Log::Agent(3) or the README file included with the distribution for license information. SEE ALSO
Mail::Mailer, Log::Agent::Driver(3), Log::Agent(3). perl v5.10.0 2002-05-12 Agent::Driver::Mail(3pm)
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