I found the article I was reading before about a tarpitting solution 
that doesn't simply take the website offline.

http://www.secureworks.com/research/threats/ddos/

Tom Eastep wrote:
> Christ Schlacta wrote:
>> I'm aware of, but have never tried a technique called tarpitting that  
>> is supposed to be very useful in your situation.
> 
> tarpitting a DDOS attack against a legitimate website takes the site
> offline.
> 
> The TARPIT target is available in xtables-addons and it is easy to
> construct an action to invoke it:
> 
> Assuming shorewall-perl....
> 
> /etc/shorewall/actions:
> 
> Tarpit
> 
> /etc/shorewall/action.Tarpit
> 
> <empty file>
> 
> /etc/shorewall/Tarpit:
> 
> use Shorewall::Chains;
> 
> add_rule $chainref, "-p tcp -j TARPIT";
> 
> /etc/shorewall/rules
> 
> Tarpit        net     ...     tcp     80      -       ...
> 
> -Tom
> 
> 
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