Global Blackhole Service

Patrick W. Gilmore patrick at
Sat Feb 14 22:45:11 UTC 2009

On Feb 14, 2009, at 5:43 PM, Florian Weimer wrote:
> * Steven M. Bellovin:
>> As Randy and Valdis have pointed out, if this isn't done very  
>> carefully
>> it's an open invitation to a new, very effective DoS technique.  You
>> can't do this without authoritative knowledge of exactly who owns any
>> prefix; you also have to be able to authenticate the request to
>> blackhole it.  Those two points are *hard*.
> If you want to run a public exchange point, you need to solve the same
> announcement validation problem.  Multiple organizations appear to do
> it successfully, so it can't be that difficult.

No you don't.

And yes it is.

To be clear, I am not saying it should or should not be done, just  
that your comparison is invalid.


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