Re: VoIP RTP Analysis, Lost Packet Analysis

["RUOFF, LARS (LARS)** CTR **" <lars.ruoff () alcatel-lucent com>]

It can be a capture method artefact, like badly configured mirroring.
 
But thinking about it, pairwise duplicate packet should give a total of -50% packet loss.
-100% seems to indicate that *all* packets are seen as duplicate of the first one, otherwise said that sequence number 
is not increasing at all.
 
regards,
Lars
 


________________________________

From: Martin Visser [mailto:martinvisser99 () gmail com] 
Sent: mardi 12 avril 2011 11:16
To: Community support list for Wireshark
Cc: RUOFF, LARS (LARS)** CTR **
Subject: Re: [Wireshark-users] VoIP RTP Analysis, Lost Packet Analysis


I can't imagine any normal network where you would get duplicate RTP packets (they are UDP datagrams, so who is going 
to resend them?) 

Regards, Martin

MartinVisser99 () gmail com



On 11 April 2011 17:30, RUOFF, LARS (LARS)** CTR ** <lars.ruoff () alcatel-lucent com> wrote:



        What you describe can happen if you have all packets as duplicates or if they all have the same RTP sequence 
number.
        Your sample capture file will tell us.
        If you limit the file to a reasonable size (10 successive RTP packets from the stream will be sufficient to see 
where the problem is), there's no problem for posting it as an attachment on this list.
        
        Lars
        
        
        
        ________________________________
        
        From: wireshark-users-bounces () wireshark org [mailto:wireshark-users-bounces () wireshark org] On Behalf Of 
Barry Constantine
        Sent: samedi 9 avril 2011 16:24
        To: wireshark-users () wireshark org
        Subject: [Wireshark-users] VoIP RTP Analysis, Lost Packet Analysis
        



        Hi,
        
        
        
        I am analyzing VoIP capture files in Wireshark 1.4 and am confused about the RTP analysis results.
        
        
        
        The jitter results match what I expect, but the packet loss results do not.
        
        
        
        I know for a fact that the file contains no packet loss and yet the RTP analysis screen reports all packets as 
lost "negatively" (and gives an odd -100% value).
        
        
        
        Any ideas?
        
        
        
        Thanks,
        
        Barry
        
        
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