[ns] about drop packet

[荒畑 成利]

hi all

I want to no buffering all packet.

I use DropTail queue.

I wrote TCL script

 $ns queue-limit $n0 $n1 2

if queue-limit's value 1, all packets dropped!

tracefile is below

+ 0.1 0 1 cbr 125000 ------- 1 0.0 1.0 0 0
- 0.1 0 1 cbr 125000 ------- 1 0.0 1.0 0 0
+ 0.1 0 1 cbr 125000 ------- 2 0.1 1.0 0 1
+ 0.1 0 1 cbr 125000 ------- 3 0.2 1.0 0 2
d 0.1 0 1 cbr 125000 ------- 3 0.2 1.0 0 2
+ 0.100587 0 1 cbr 125000 ------- 2 0.1 1.0 1 3
d 0.100587 0 1 cbr 125000 ------- 2 0.1 1.0 1 3
- 0.101 0 1 cbr 125000 ------- 2 0.1 1.0 0 1
+ 0.103016 0 1 cbr 125000 ------- 2 0.1 1.0 2 4
- 0.103016 0 1 cbr 125000 ------- 2 0.1 1.0 2 4
+ 0.103835 0 1 cbr 125000 ------- 2 0.1 1.0 3 5
- 0.104016 0 1 cbr 125000 ------- 2 0.1 1.0 3 5
+ 0.104059 0 1 cbr 125000 ------- 2 0.1 1.0 4 6
+ 0.104254 0 1 cbr 125000 ------- 3 0.2 1.0 1 7
d 0.104254 0 1 cbr 125000 ------- 3 0.2 1.0 1 7
+ 0.104457 0 1 cbr 125000 ------- 3 0.2 1.0 2 8
d 0.104457 0 1 cbr 125000 ------- 3 0.2 1.0 2 8
- 0.105016 0 1 cbr 125000 ------- 2 0.1 1.0 4 6

fid_= 2 && seqno_= 0's packet is buffering ! but I want to drop this
packet!! .

please help me everyone.
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