Before everyone goes off and re-invents the wheel, please heed the advice already provide by Randy, Steve, and Valdis. Community instigated RTBH is used by a variety of Operational Security Communities. _Experience_ has demonstrated caution. _Experience_ has pointed to the ways you use these tools. _Experience_ has also demonstrated that you DO NOT let the bad guys know about the details of what you do to fight them. The people who DOS your network are most like know - if not already on NANOG! All of you what are getting fired up about a "Global Blackhole Service" ..... 1. Make sure you and your upstream have an agreement on how to work DDOS incidents. 2. Make sure you and your peer have an agreement on how to work DDOS incidents. 3. Establish a procedure for resolving DDOS incidents. 4. Get vetted and join Operational Security Communities. Details for all of this are on the NANOG archives: http://www.nanog.org/presentations/archive/ Keyword search "Security" Get this done first, then consult with your peers in those Operational Security communities. Not on a forum which every bad guy in the world who has a clue about Networking is keeping their eye on. Barry