Curtis Villamizar wrote:
> > [What would one do with information about an attacking ISPs]
>   

> Not a solved problem.  Back in NSFNET days it was a "we don't want to
> do this but if we do it is going to hurt you a lot more than it will
> hurt us" situation.  Not always so today and DDoS makes the job
> harder (multiple upstreams, potentially millions of sources).
>   

Indeed.  For example (by close analogy): 
http://infosecon.net/workshop/pdf/emailblocking.pdf

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