Re: Packets in different VLANS flagged as duplicated Packets in RTP Stream Analysis

[mmann78 () netscape net]

I believe you're referring to this bug:

https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4561


-----Original Message-----
From: John Powell <jrp999 () gmail com>
To: Developer support list for Wireshark <wireshark-dev () wireshark org>
Sent: Fri, Aug 10, 2012 8:58 am
Subject: Re: [Wireshark-dev] Packets in different VLANS flagged as duplicated Packets in RTP Stream Analysis


Hi Everyone,

I should have noted the following:


I am running Wireshark 1.8.1 (compiled from source) under CentOS 6.3.


Dumpcap command command line is:



/usr/local/bin/dumpcap -B 32 -i 2 -f vlan and (not vrrp and not udp port 1985 and not ether host 01:00:0c:cc:cc:cc) -b 
files:1200 -b filesize:250000 -b duration:900 -w /var/opt/data/captures/eth1.cap


Thanx in advance for any guidance!

John



On Fri, Aug 10, 2012 at 6:48 AM, John Powell <jrp999 () gmail com> wrote:

Hi Everyone,

I am running Dumpcap as a service.

My users have told me that when they select a packet capture then select Telephony - RTP - Show all Streams that it 
indicates packets are being duplicated (negative packet loss).

For the packets being duplicated (negative packet loss), I discovered that there are in fact 2 packets being seen by 
Wireshark with the same SRC/DST IP Addresses and the same ID number BUT different VLANS tags.  

Is this an error in Wireshark that should be fixed or is there some way to configure Wireshark to look at the VLAN tag 
as well as the ID number before determining a packet is duplicated?

Thanx alot!

John



 
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