[Sake Blok <sake@xxxxxxxxxx>]

On 26 feb 2010, at 13:28, Adriana Hava wrote:

I need to calculate the ratio of retransmitted packets to transmitted frames for each second.
I know I can show only retransmitted packets in Wireshark using the filter wlan.fc.retry eq 1.

I would be interested in identifying the retransmitted packets from the exported file that contains all the packets. Is this possible ?

Thanks!

You could use tshark, try the following:

tshark -r <file> -q -z io,stat,1,frame,wlan.fc.retry==1

You would get something similar to:

MacSake:~ sake$ tshark -r dns.cap -q -z io,stat,10,frame,dns.flags.response==0,dns.flags.response==1

===================================================================

IO Statistics

Interval: 10.000 secs

Column #0: frame

Column #1: dns.flags.response==0

Column #2: dns.flags.response==1

                |   Column #0    |   Column #1    |   Column #2    

Time            |frames|  bytes  |frames|  bytes  |frames|  bytes  

000.000-010.000    2560    231622   1281     97349   1279    134273 

010.000-020.000    2470    223506   1236     93936   1234    129570 

020.000-030.000    2334    211212   1168     88782   1166    122430 

===================================================================

MacSake:~ sake$ 

Cheers,

     Sake