Wireshark-users: Re: [Wireshark-users] Filter retransmitted packets
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From: Sake Blok <sake@xxxxxxxxxx>
Date: Fri, 26 Feb 2010 18:30:49 +0100

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