DNS problems to RoadRunner - tcp vs udp

Roland Dobbins rdobbins at cisco.com
Sun Jun 15 19:11:20 UTC 2008

On Jun 15, 2008, at 8:02 PM, Joe Greco wrote:

> I think a real solution would be more sophisticated than this, but  
> it's a starting point.

In addition to the BCPs already mentioned by Sean and Nathan, a good  
detection/classification/traceback system plus S/RTBH can be helpful,  
and there are commercial DDoS mitigation services/scrubbers available  
from various SPs/vendors which have DNS-specific functionality, as  
well.  Blocking TCP/53 is definitely not an optimal solution, as many  
have already pointed out.

Roland Dobbins <rdobbins at cisco.com> // + mobile

      History is a great teacher, but it also lies with impunity.

                    -- John Robb

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