Re: RTP v/s UDP

[Kevin Cullimore <kcullimo () runbox com>]

On 4/7/2010 7:03 PM, Martin Visser wrote:
> Kevin,
>
> I'm sure almost every VOIP implementation that is using RTP over UDP 
> for carrying voice traffic does care about their packets arriving on 
> time ;-) The differences is that timeliness of arrival of those RTP 
> frames is done through provision of QoS configuration at network 
> components along the path, usually through attention to queueing and 
> priority levels, and signalling though protocols like 802.1p and 
> DiffServ.
>
> Because RTP provides timestamping it makes it a little easier to 
> quantitatively measure the time-oriented charactistics of that traffic 
> flow.
> Regards, Martin

Martin,

Understood. My point had to do with RTP not relying "exclusively" on 
udp-specific features to manage & control RTP traffic, as the original 
poster mentioned during subsequent posts.
> MartinVisser99 () gmail com <mailto:MartinVisser99 () gmail com>
>
>
> On Thu, Apr 8, 2010 at 7:17 AM, Kevin Cullimore <kcullimo () runbox com 
> <mailto:kcullimo () runbox com>> wrote:
>
>     On 4/7/2010 3:07 PM, ankur aggarwal wrote:
> >     Hi Anders,
> >      Thanxs for the reply. My problem is bit different. I want to use
> >     UDP only. As
> >     http://www.mail-archive.com/wireshark-users () wireshark org/msg03818.html
> >     link suggest we cannot use UDP for these calculation, instead use
> >     RTP directly. In my project i need to know the difference in RTP
> >     and UDP.
>     UDP is deployed as a transport protocol precisely when people
>     DON'T care about measuring traffic that accurately.
>
> >     Can any body tell me how to convert .pcap (wireshark file) to
> >     excel file. I found this link http://packetbone.com/ . But
> >     unfortunately i donot PC with 32 bit + XP in my lab..
> >
> >     Ankur
> >
> >     On Wed, Apr 7, 2010 at 2:57 PM, Anders Broman <a.broman () telia com
> >     <mailto:a.broman () telia com>> wrote:
> >
> >         Hi,
> >           Goggling for VLC player found http://www.videolan.org/vlc/
> >         very breifly looking at the info it looks like there are
> >         several options
> >         for how the video stream is sent if it really is RTP in your
> >         case you could use decode as and select RTP and then use the
> >         RTP analysis
> >         Note that it designed to analyse Audio and some values may
> >         not be entirely correct/applicable for Video.
> >
> >         You can also use the IO-graph to calculate the  bandwidth. If
> >         RTP isn't used you may have to digg trough the
> >         documentation/sources
> >         of the VLC player to find out if you can do the calculations
> >         you need. You may have to export the data from the RTP
> >         analysis and perform your own calculation from the raw data
> >         or update Wiresharks sources to do it for you. You may also
> >         have to know what codec(s) are used to do correct
> >         calculation. You must also consider where your traces are
> >         made and perhaps compare results
> >         from the sender side with results on the receiver side. No
> >         easy answers here :-)
> >         Regards
> >         Anders
> >
> >         ankur aggarwal skrev 2010-04-07 20:10:
> > >         Hi Antony ,
> > >           Thanxs for your response. What does this mean *"RTP is
> > >         commonly carried within UDP"** ??* I found that wireshark
> > >         provide support for RTP* *as
> > >         http://wiki.wireshark.org/RTP_statistics* . If i need to
> > >         calculate jitter,bandwith etc. What should i use. How can i
> > >         use UDP
> > >
> > >         Ankur
> > >         *
> > >         On Wed, Apr 7, 2010 at 1:57 PM, Anthony Murabito
> > >         <anthony () iol unh edu <mailto:anthony () iol unh edu>> wrote:
> > >
> > >             Hi Ankur,
> > >
> > >             RTP is commonly carried within UDP. Although this is not
> > >             mandatory, there are other possible underlying protocols
> > >             such as AAL5.
> > >
> > >             Regards,
> > >
> > >             Anthony
> > >
> > >             On 04/07/2010 01:49 PM, ankur aggarwal wrote:
> > > >             Hello All,
> > > >               I am a new user of wireshark. I am working on stream
> > > >             video packets and receving at other end through
> > > >             wireless hops (Access point). I used to do this using
> > > >             VLC player and thru UDP protocol. I started using
> > > >             Wireshark for analysis of my packets. In between i
> > > >             found we cannot calculate jitter , delay etc.. through
> > > >             UDP. Later i found RTP protocol. Now the question is
> > > >             what exactly is the difference between UDP and RTP in
> > > >             term of networking and in term of Wireshark s/w working.
> > > >
> > > >             I need some proof as this information will be needed
> > > >             for my publication.
> > > >             Help me plz
> > > >             -- 
> > > >             With Regards
> > > >
> > > >             Ankur Aggarwal
> > > >             Research intern
> > > >             Optical Zeitgeist Laboratory
> > > >             Institut National de la Recherche Scientifique (INRS) - ÉMT
> > > >             800, de la Gauchetière Ouest, bureau 6900
> > > >             Montréal, QC, H5A 1K6
> > > >             CANADA
> > > >
> > > >             Ph: +1 514 966-2661
> > > >             E-mail: ankur.1066 () gmail com <mailto:ankur.1066 () gmail com>
> > > >             Web: www.zeitgeistlab.ca <http://www.zeitgeistlab.ca>
> > > >             Group Member Page:
> > > >             http://zeitgeistlab.ca/doc/groupmembers.html
> > > >
> > > >
> > > >
> > > >             ___________________________________________________________________________
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> > >             -- 
> > >             *Anthony*
> > >
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> > >
> > >
> > >
> > >         -- 
> > >         With Regards
> > >
> > >         Ankur Aggarwal
> > >         Research intern
> > >         Optical Zeitgeist Laboratory
> > >         Institut National de la Recherche Scientifique (INRS) - ÉMT
> > >         800, de la Gauchetière Ouest, bureau 6900
> > >         Montréal, QC, H5A 1K6
> > >         CANADA
> > >
> > >         Ph: +1 514 966-2661
> > >         E-mail: ankur.1066 () gmail com <mailto:ankur.1066 () gmail com>
> > >         Web: www.zeitgeistlab.ca <http://www.zeitgeistlab.ca>
> > >         Group Member Page: http://zeitgeistlab.ca/doc/groupmembers.html
> > >
> > >
> > >
> > >         ___________________________________________________________________________
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> >
> >
> >     -- 
> >     With Regards
> >
> >     Ankur Aggarwal
> >     Research intern
> >     Optical Zeitgeist Laboratory
> >     Institut National de la Recherche Scientifique (INRS) - ÉMT
> >     800, de la Gauchetière Ouest, bureau 6900
> >     Montréal, QC, H5A 1K6
> >     CANADA
> >
> >     Ph: +1 514 966-2661
> >     E-mail: ankur.1066 () gmail com <mailto:ankur.1066 () gmail com>
> >     Web: www.zeitgeistlab.ca <http://www.zeitgeistlab.ca>
> >     Group Member Page: http://zeitgeistlab.ca/doc/groupmembers.html
> >
> >
> >
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