Michaele,

On 03.08.2004 15:41 Michele Marazza wrote:

> Arnold, Nico,
> 
> Let suppose to have Arbor or any other "profesional anti-DDos tool" and that the 
> tool tell me: you 
> have an attack of (almost) 1Gbps towards IP address x.y.z.w. What do you do now? You 
> still have 
> hundreds of Mbps coming from many ingress points, all this flows aggregate then 
> towards the x.y.z.w 
> and fill your links, the attacked customer is completely down, other customers are 
> impacted as well. 
> The only way I see to solve this is to blackhole that traffic at the ingress points, 
> this has the 
> following consequences:
> - all other customers can work again
> - the attacked customer can (at least) work with all other IP addresses
> - as it is a DDos, the ingress links are not filled up, no issue here
> 

well ... a better solution is to redirect this traffic at the ingress
point to go thru your washing machine (e.g. Riverhead Guard) and
re-inject the washed traffic into your network.



Arnold

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