Wireshark · Wireshark-users: Re: [Wireshark-users] RTP packet lost statistics

[Jeff Morriss <jeff.morriss.ws@xxxxxxxxx>]

Ji Zhang wrote:
> Dear all,
>
> I�m currently using Wireshark v1.0.0 to analyse a Voice-over-802.11 
> session trace captured by the Airopeek Wifi sniffer. I extracted the RTP 
> session and tried to use the Wireshark RTP statistics tool to examine 
> the RTP packet loss rate. However, Wireshark did not give the actual RTP 
> packet loss statistics, instead, what it gave was the statistics of the 
> number of RTP packet retransmissions and regarded these retransmissions 
> as packet losses. Obviously RTP packet retransmissions only could happen 
> at the 802.11 layer, so this would rather be more like 802.11 packet 
> loss statistics.
>
> Could anybody let me know if this is the expected behaviour? If not, is 
> there any patch/upgrade that fixes the issue? If yes unfortunately, is 
> there any way I may get the packet loss statistics at the actual RTP 
> layer using Wireshark? Much appreciated!

There is a preference for the 802.11 dissector 
(Edit->Preferences->Protocols->IEEE 802.11): "Call subdissector for 
retransmitted 802.11 frames".  You might want to try turning that off 
(the default appears to be on--should it be that way?).