Reza...
Here is an idea, but it will only dump the duplicate packet (not the
original) and it is set for TCP only. No UDP equivalent that I know of.
tshark -R tcp.analysis.retransmission -w <filename>
Use the capital 'R' to indicate you are using display filter syntax. The
retransmissions are defined as TCP packets that contain data but use the
same sequence number. There is some checking done to ensure the packets are
not just out-of-order packets (which is probably not typical anyway).
I think the TCP.analysis.duplicate_ack will only show you that a receiver
has noticed a missing segment and is re-acking for the missing segment. A
good thing to know, but it seems you are more interested in duplicate data
packets (UDP-based application?)...
Hope that helps...
Laura
lchappell@xxxxxxxxxxxxxxxx
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-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Fardid, Reza
Sent: Tuesday, January 16, 2007 5:58 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Duplicate Packet ID
Hi Hans,
How does it identify duplicates?
Is there a UDP equivalent?
Thanks,
-Reza
-----Original Message-----
From: wireshark-users-bounces@xxxxxxxxxxxxx
[mailto:wireshark-users-bounces@xxxxxxxxxxxxx] On Behalf Of Hans Nilsson
Sent: Monday, January 15, 2007 11:46 PM
To: Community support list for Wireshark
Subject: Re: [Wireshark-users] Duplicate Packet ID
How about "tcp.analysis.duplicate_ack".
On Mon, 15 Jan 2007 14:29:56 -0800, "Fardid, Reza" <RFardid@xxxxxxxxx>
said:
> Hi,
>
>
>
> Is there a mechanism in T(ethereal) for identification (e.g., using
> Frame Check) and filtering (capture or display) of duplicate packets?
>
> I realize there is a performance penalty to pay for such capture
> filtering, if supported.
>
>
>
> Thanks,
>
> -Reza
>
>
>
>
>
>
>
--
Hans Nilsson
hasse_gg@xxxxxxxx
--
http://www.fastmail.fm - Or how I learned to stop worrying and
love email again
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