Isn't this what the DRD parameters are for? Assigning a queue depth
where Nistnet starts to drop packets.

-a <src> <dst> --drd <drdmin> <drdmax>

>From the Nistnet website:

The DRD parameters are the minimum and maximum queue lengths for the DRD
algorithm. More precisely, if the number of packets queued is less than
the minimum specified, DRD won't drop any packets. When the minimum is
reached, DRD starts randomly dropping 10% of the incoming packets. This
percentage ramps up with an increase in queue length, reaching 95% when
the maximum is reached. (You can actually have more packets queued than
the "maximum," but with 95% of all new packets being dropped, you tend
not to get very much above the maximum.)

Jonathon 

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