[j-nsp] Packet retransmissions

[Ramesh Babu Koduru]

Craig ,

Thank you for your inputs ..but I don't see any kind of packet loss on
this link ..and there is no question of re ordering as we have only one
link from source to destination and all packets are hitting a single
queue ...
I am still wondering how these re transmissions are happening on this
link

Regards,
Ramesh babu
-----Original Message-----
From: Craig Pierantozzi [mailto:tozz at arpa.bind.com] 
Sent: Tuesday, April 05, 2005 10:05 PM
To: Ramesh Babu Koduru
Subject: Re: [j-nsp] Packet retransmissions

retranmissions would be common if there was
corruption, packet loss or packet re-ordering.

-Craig

* Thus spake Ramesh Babu Koduru (rameshbabu.koduru at vsnl.co.in):

> 
> I am using sniffer at receiving end and finding retransmissions at
> receiving end.
> These re transmission packets are visible even when I am doing simple
> ftp from source to destination eventhough I am not sure what's causing
> these re transmissions
> The frequency of re transmission is 10-15mins ...
> 
> This MPLS network is an Inter continental network ( ie from India to
> USA) and the RTT b/w source and destination is 290msec ....
> Are these re transmissions on such a long haul network are very
common?
> If so ..what could be the main reasons for such re transmissions????
> 
> 
> Thanks
> Ramesh babu
> 
> >Hi All ,
> >
> >We are testing one broadcast video application on IP MPLS network
> >RTT between Video source & receiver is 290msec . Basically we are
> >transporting multiple TV Channels on MPLS network and trying to watch
> >the quality at other end..........but unfortunately we see occasional
> >video freezes at receiving end  and but there is no packet loss on
the
> >network .When I put sniffer to observe packet patterns , I observed
> that
> >there are packet  re transmissions on the network .Can any one here
has
> >experienced this kind of problem ? What could be the reason for
packet
> >retransmissions while I am not seeing any kind of packet loss on the
> >network??
> 
> I'm not sure what the answer to your problem is, but here are a few
> additional questions or things you could try to troubleshoot the
> problem:
> 
> I assume that the retransmissions are coming from the video source?
> 
> Are you using the sniffer at the receiving end and seeing duplicate
> packets?  Or do you have the sniffer at the transmit end and see
> duplicate packets coming direclty from the source?
> 
> What transport layer is the application using?  Is there an
application
> layer timer that is triggering a retransmit based on a timeout?
> 
> How far apart (in time) are the duplicate packets?
> 
>                                                  dave
> 
> 
> 
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