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Re: Measuring PoP to PoP latency--tools to use?

  • From: Sean Donelan
  • Date: Wed Aug 22 21:26:20 2001

On Wed, 22 August 2001, k claffy wrote:
> On Wed, Aug 22, 2001 at 06:08:15PM +0200, Adam Obszynski wrote:
>   > What tools exist that will periodically log into multiple routers and run
>   > ping tests
>   > to various destinations and then record the results in graphical form?
>   maybe the RTR cisco router feature for sonde-like probing ?

InternetMCI(purchased by Cable & Wireless) and AT&T spent a lot of
effort developing their tools.  I haven't seen any commercially available
systems which come close.  C&W and AT&T seem to be unique among huge backbone
providers in publishing their network performance.

However, an alternative for measuring round-trip times with ICMP is
setting up a full mesh of NTP assocations.  As part of the calculations
of the "time" get an ongoing measurement of network delay between the
routers.  You can use your favorite tool to read the NTP associations
table, and generate a nice web page.  I believe this is how UUNET use
to do their version.