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Detect shot DDOS using RMON on 10G interface

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Hello,

 

currently we are experiencing a lot of very short but strong ddos attacks. i would like to setup a rmon alarm that detects anything over 5gbit/s. we are using a mixed stack with ex4500 and ex4200.

 

as far as i got im unable to lower 'interval' below 10, or i get empty values and false positives for falling-threshold. my issue is that according to my calculation 5gbit/s over 10 seconds are 6250000000 octets, but the maximun for rising-threshold is 2147483647.

 

any idear for a workaround? or am i doing the calculations wrong?

 

thanks a lot for your help!

regards


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