This is how I am setting the size of a droptail queue: $ns queue-limit $n1 $n2 $X
I am seeing behavior where for 1 <= $X <= ~180 everything works fine. If you push X to say 200, then suddenly there are no more packet drops, and there always appears to be 183-186 packets in the queue. What I am trying to simulate is the rule of thumb buffer sizing which is 2*BandwidthDelayProduct which for high speed links is on the order of thousands of packets. I've been through queue.cc, queue.h, drop-tail.h and drop-tail.cc and can't figure out what's going on. Any thoughts? ~Ethan