[smokeping-users] Re: transit time measurement tool needed
simon at limmat.switch.ch
Fri Oct 1 21:20:16 MEST 2004
Burkhard Kaas writes:
> we want to monitor packet transit time and packet loss rate. Packet
> round trip time (RTT) and ping loss rate are not sufficient for us,
> because we don't see which direction causes variations in RTT and
> packet losses.
> Does anyone know about tools do do this? I know about the problems
> with accurate time synchronization, we have GPS time sync with
> accuracy better than 100us available. It would be perfect to view
> the results with smokeping.
I know several systems that measure one-way delay and loss. As you
say, one-way delay requires synchronisation (one-way loss is easy
though). Both require special software at both ends.
rude/crude - http://rude.sourceforge.net/
Simple command-line tools to send and receive UDP packets.
The sender generates packets with timestamps, according to
either a rate/size, or a script with packet sizes and relative
The receiver generates a log file including sender timestamps
(from the packets) and receiver timestamps, which you could
then use to feed something like SmokePing.
It shouldn't be too difficult to build a system based on this
OWAMP - http://e2epi.internet2.edu/owamp/
Something like rude/crude, but running as a daemon with some
signaling mechanism to initiate measurements. I don't
personally have any experience with this.
RIPE TTM - http://www.ripe.net/test-traffic/
An entire network of systems running one-way delay and loss
measurements (and traceroutes). You can order one or several
boxes and have RIPE NCC run them for a fee. Measurement data
is processed centrally in Amsterdam, with useful analyses,
nice graphical representations, and good query (and on-demand
graphing) options. Normally all measurements from all boxes
is publicly accessible.
I'm sure there are others.
Hope this helps,
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