Wireshark · Wireshark-users: Re: [Wireshark-users] TurboCap card / out-of-order frames

["Gianluca Varenni" <gianluca.varenni@xxxxxxxxxxxx>]

Are you using the passthru feature of TurboCap?

Have a nice day
GV

--------------------------------------------------
From: "Stuart Kendrick" <skendric@xxxxxxxxx>
Sent: Thursday, January 14, 2010 12:23 PM
To: "Community support list for Wireshark" <wireshark-users@xxxxxxxxxxxxx>
Subject: Re: [Wireshark-users] TurboCap card / out-of-order frames

> Hi Gianluca,
>
> see https://vishnu.fhcrc.org/nps/seqc-crash.pcap
>
> the frame numbers in my text below were taken from this trace
>
> ip.addr==128.95.181.47
>
> Also, i'm curious about the negative delta T numbers
>
> --sk
>
>
> On 1/14/2010 11:17 AM, Gianluca Varenni wrote:
> > Are you using the passthru feature?
> >
> > Can you send me a small trace file showing the issue to my work email
> > (gianluca.varenni@xxxxxxxxxxxx)?
> >
> > Have a nice day
> > GV
> >
> > --------------------------------------------------
> > From: "Stuart Kendrick"<skendric@xxxxxxxxx>
> > Sent: Thursday, January 14, 2010 11:04 AM
> > To:<wireshark-users@xxxxxxxxxxxxx>
> > Subject: [Wireshark-users] TurboCap card / out-of-order frames
> >
> >
> > > I'm using a TurboCap card to capture in-line with an end-station.
> > >
> > > Repeatedly through the trace, I see out of order frames.  For example,
> > >
> > > [Numbers are TCP segment numbers]
> > >
> > > Client ACKs Server sends Segment Frame #
> > > 1,183,091 22034
> > > 1,179,039 22035
> > > 1,180,499 22036
> > > 1,181,959 22037
> > > 1,183,091 22038
> > > 1,179,039 22041
> > > 1,183,091 22042
> > >
> > > And then, I even see an out-of-order three-way TCP handshake:
> > >
> > >
> > > Client sends SYN 
> > > 28898
> > > Client sends ACK 
> > > 28899
> > > Server sends SYN-ACK                                         28900
> > >
> > >
> > > I don't believe that that the client really sent the ACK before
> > > receiving the SYN-ACK.
> > >
> > > So I'm beginning to think that the TurboCap card misorders frames when
> > > it captures.
> > >
> > > I captured using 'dumpcap -i 6 -w rollingcapture.pcap -b filesize:50000'
> > >
> > > TurboCap driver v1.3
> > >
> > > Anyone else seen this issue?
> > >
> > > --sk
> > >
> > > Stuart Kendrick
> > > FHCRC
> > >
> > >
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