Just plain ignorant post (Score 1, Informative)

The assertion that packet filtering firewalls cannot block this attack is just plain wrong. For instance, Check Point, and probably other firewall manufacturers, had a block for this attack back in April of 04. Firewalls aren't just the freeware open source flavor of the month gang. Some corporations actually buy more advanced tools that have features beyond blocking a given port.

Reference: http://www.checkpoint.com/defense/advisories/publi c/2005/cpai-28-Dec.html