[ns] 802-11 bug?!

[Octav Chipara]

Hi,

I have disabled the RTS/CTS as shown in the mail archives however, I do 
get the following trace:

s 10.016815408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
999.696886] ------- [26:252 25:252 2 25] type=data
r 10.017231624 _25_ MAC  --- 26 rt-mac 0 [13a 19 1a 800] [energy 
996.990935] ------- [26:252 25:252 2 25] type=data
s 10.017241624 _25_ MAC  --- 0 ACK 38 [0 1a 0 0] [energy 996.990935]
s 10.018439408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
996.991567] ------- [26:252 25:252 2 25] type=data
s 10.020203408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
996.990930] ------- [26:252 25:252 2 25] type=data
s 10.021487408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
996.990251] ------- [26:252 25:252 2 25] type=data
s 10.027911408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
996.989716] ------- [26:252 25:252 2 25] type=data
s 10.047955408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
996.987639] ------- [26:252 25:252 2 25] type=data
s 10.056759408 _26_ MAC  --- 26 rt-mac 52 [13a 19 1a 800] [energy 
996.981476] ------- [26:252 25:252 2 25] type=data
D 10.057493408 _26_ MAC  RET 26 rt-mac 52 [13a 19 1a 800] [energy 
996.978685] ------- [26:252 25:252 2 25] type=data

As you can see node 26 sends a packet to node 25 and node 25 gets it. 
However, node 26 keeps on attempting to transmit the same packet. This 
looks to me like a clear violation of how the mac is supposed to work. 
Furthermore, there are ACK packets which when using the basic access 
method are not used. Can these be also disabled? Has anyone seen the 
same type of behavior?

Thanks for your help,

-- Octav

-- 
Octav Chipara
Mobile Computing Laboratory <http://www.cs.wustl.edu/mobilab/>
Department of Computer Science & Engineering
Washington University in St. Louis
http://www.cse.wustl.edu/~ochipara/ <http://www.cse.wustl.edu/%7Eochipara/>