[stankinator@xxxxxxxxxxxxx]

thanks

----- Original Message -----
From: "Francisco Alcoba (ML/EEM)" <francisco.alcoba@xxxxxxxxxxxx>
Date: Tuesday, September 14, 2004 11:49 am
Subject: RE: [Ethereal-users] Packets out of Order

> Hi,
> 
> > > > How Do I determine from a capture that packets are being 
> > > > received out of order?
> 
> > > if your application protocol sits atop tcp, then ethereal 
> > > will display
> > > those packets as [TCP out-of-order].
> 
> > This is an h.323 video stream. My MCU is complaining of OOP 
> > and I am just trying to validate this.
> 
> That means video is probably sent via RTP. If Ethereal knows it is 
> RTP, it can look for sequence numbers in the stream packets. 
> 
> The fact that Ethereal knows or not whether the packets are RTP is 
> a bit complex; you can see a summary in 
> http://www.ethereal.com/faq.html#q5.32
> Anyway, if you know -or suspect- that some packets that Ethereal 
> shows as UDP are RTP, you can select one of them, go to Analyze -> 
> Decode As and configure it to be decoded as such. After that you 
> can see the sequence number in the decoded packet, and you can go 
> to Analyze -> RTP -> Stream Analysis and you will get information 
> on the sequence number and, in the Status column, you'll find a 
> comment if the order is wrong.
> 
> If you are not using RTP, you still might be able to infer 
> something from the Identification field in the IP header, which is 
> not forced to be, but at least sometimes is, sequential -i.e. if 
> you find 1234, 1235, 1236, 1238 and 1237 you can strongly suspect 
> the last two have been reordered-.
> 
> Regards,
> 
> Francisco
> 
> > -----Original Message-----
> > From: ethereal-users-bounces@xxxxxxxxxxxx
> > [ethereal-users-bounces@xxxxxxxxxxxx]On Behalf Of
> > stankinator@xxxxxxxxxxxxx
> > Sent: martes, 14 de septiembre de 2004 14:50
> > To: ronnie sahlberg; Ethereal user support
> > Subject: Re: [Ethereal-users] Packets out of Order
> > 
> > 
> > Thank.
> > 
> > This is an h.323 video stream. My MCU is complaining of OOP 
> > and I am just trying to validate this.
> > 
> > Thanks
> > 
> > ----- Original Message -----
> > From: ronnie sahlberg <ronniesahlberg@xxxxxxxxx>
> > Date: Tuesday, September 14, 2004 7:05 am
> > Subject: Re: [Ethereal-users] Packets out of Order
> > 
> > > if your application protocol sits atop tcp, then ethereal 
> > will display
> > > those packets as [TCP out-of-order].
> > > 
> > > if your application sits atop something else you will have 
> > to add code
> > > to detect this.
> > > 
> > > 
> > > 
> > > On Mon, 13 Sep 2004 22:31:32 -0400, stankinator@xxxxxxxxxxxxx
> > > <stankinator@xxxxxxxxxxxxx> wrote:
> > > > How Do I determine from a capture that packets are being 
> > > received out of order?
> > > > 
> > > > _______________________________________________
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> > > > Ethereal-users@xxxxxxxxxxxx
> > > > http://www.ethereal.com/mailman/listinfo/ethereal-users
> > > >
> > > 
> > > _______________________________________________
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> > > Ethereal-users@xxxxxxxxxxxx
> > > http://www.ethereal.com/mailman/listinfo/ethereal-users
> > > 
> > 
> > _______________________________________________
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> > Ethereal-users@xxxxxxxxxxxx
> > http://www.ethereal.com/mailman/listinfo/ethereal-users
> > 
> 
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