Importing into rc.firewal rules

[Francisco Reyes]

On Sat, 20 Nov 2004, Poul-Henning Kamp wrote:

> If the list is long it may be almost as good, if not better, to use
> blackhole routes for it.

I was not familiar with the term. Looking in Google came up with a link. 
However in that link they recommend against that method.

http://tinyurl.com/5r5cl

Also any link on how to implement it?
What would be the advantage of that route vs ipfw?