[ns] Different TCP-Packetsizes

[Ankit Agarwal]

Erwin,

In the lines about the dropped packets. The term "CBK"
is the reason for dropping.

The file cmu-trace.h has the meanings of all the
reasons for dropping packets.

I consulted the file and it says that "CBK" implies a
MAC Callback. I don't know what this means but I hope
that it is enough to get you started in the right
direction.

Hope this helps.

Ankit.

--- Erwin Haller <ehaller@mobile.nt.tuwien.ac.at>
wrote:
> 
> Hi !!
> 
> I have a very serious and weird problem. I make
> simulations with wireless
> nodes and i set the MAC/802_11 bandwidth_ to 512000.
> I use the Shadowing
> Model and want to simulate the throughput over
> different distances from
> one node to another and over different TCP
> packetsizes. My problem is now,
> that I can't explain if the packetsize goes higher
> than 4082, the packets
> were droppped and the trace file looks like:  
> + 5.008042 1 0 tcp 60 ------- 2 1.0.1.0 0.0.0.0 0 2 
> - 5.008042 1 0 tcp 60 ------- 2 1.0.1.0 0.0.0.0 0 2 
> r 5.00909 1 0 tcp 60 ------- 2 1.0.1.0 0.0.0.0 0 2 
> + 5.00909 0 1 ack 40 ------- 2 0.0.0.0 1.0.1.0 0 3 
> - 5.00909 0 1 ack 40 ------- 2 0.0.0.0 1.0.1.0 0 3 
> r 5.010122 0 1 ack 40 ------- 2 0.0.0.0 1.0.1.0 0 3 
> D 5.350714118 _2_ RTR CBK 4 tcp 4103 [25c 0 1 800]
> D 5.688508990 _2_ RTR CBK 5 tcp 4103 [25c 0 1 800]
> D 6.350020368 _2_ RTR CBK 6 tcp 4103 [25c 0 1 800] 
> D 7.349560368 _2_ RTR CBK 7 tcp 4103 [25c 0 1 800]
> D 8.550160368 _2_ RTR CBK 8 tcp 4103 [25c 0 1 800] 
> D 10.949520368 _2_ RTR CBK 9 tcp 4103 [25c 0 1 800] 
> D 15.750980368 _2_ RTR CBK 14 tcp 4103 [25c 0 1 800]
> 
> D 25.350220368 _2_ RTR  CBK 15 tcp 4103 [25c 0 1
> 800]
> 
> So please help me!! I have no idea why are the
> packets dropped and why
> does this happen when the packetsize is higher than
> 4082. Thank you for
> your help !!
> 
> Best regards,
> Erwin Haller
>  
> 


=====
"Tough times do not last, only tough people do."
"A ship in the harbor is safe...but thats not what ships were made for."
"Do, or do not. There is no try." (Yoda)
Ankit Agarwal
5000 Oak Street, #815, Kansas City, MO 64112.
Telephone: (816) 531-4186. Email: ankit_agarwal@yahoo.com

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