From: Shawn Ostermann (sdo@picard.cs.ohiou.edu)
Date: 06/02/05
Subject: Re: tcptrace-bugs rtt estimate Date: Thu, 02 Jun 2005 10:48:20 -0400 From: Shawn Ostermann <sdo@picard.cs.ohiou.edu> Message-Id: <20050602144821.0C9237C808A@picard.cs.ohiou.edu>
It calculates the time between when a segment was sent and when the ACK
for it was received. So, technically, it's the RTT between the
measurement host and the data receiver. As Mani pointed out, the
accuracy of that will depend on the accuracy of the clock that the
measurement host is using and that pcap is putting into the packet
headers for the captured packets.
--sdo
Manikantan Ramadas <mramadas@masaka.cs.ohiou.edu> wrote:
> tcptrace's rtt estimates are based on the pcap dumpfile, and therefore
> directly depend on where the dumpfile was captured, i.e., where the
> measurement host is.
>
> - Mani.
>
> On Wed, Jun 01, 2005 at 09:58:12AM -0400, Bu, Tian (Tian) wrote:
> > Hello there,
> >
> >
> >
> > As tcptrace estimates the rtt, is this estimate for end-to-end rtt or the rtt between the measurement point and the destination?
> >
> >
> >
> > Thanks!
> >
> > -Tian
> >
>
> --
> "'Beauty is truth, truth beauty,'--that is all
> Ye know on earth, and all ye need to know." - John Keats
> ____________________________________________________________________
>
> * Manikantan Ramadas * IRG, OU * http://irg.cs.ohiou.edu/~mramadas *
> ____________________________________________________________________
This archive was generated by hypermail 2.1.7 : 06/02/05 EDT